Revert of Enable extended debugging symbols to including macro expansion. (https://codereview.chromium.org/198363002/)
Revert of Enable extended debugging symbols to including macro expansion. (https://codereview.chromium.org/198363002/)

Reason for revert:
Might be the cause for memory exhaustion during compilation on the Linux dbg build bot:

http://build.chromium.org/p/chromium.linux/buildstatus?builder=Linux%20Builder%20%28dbg%29%2832%29&number=21991

Original issue's description:
> Adding -g3 to get macro expansion support. (Default is -g2.)
> Adding -gdwarf-4 for macro expansion support.
> 
>  * gcc 4.6 outputs DWARF-2 by default
>  * gcc 4.7 outputs DWARF-4 by default
>  * clang <3.4 outputs DWARF-3 by default
>  * clang >3.4 outputs DWARF-4 by default
> 
> From http://gcc.gnu.org/onlinedocs/gcc/Debugging-Options.html
> > -g3
> >  Level 3 includes extra information, such as all the macro
> >  definitions present in the program. Some debuggers support macro
> >  expansion when you use -g3.
> >
> > -gdwarf-4
> >  Produce debugging information in DWARF format (if that is
> >  supported). The value of version may be either 2, 3 or 4; the
> >  default version for most targets is 4.  Note that with DWARF
> >  Version 2, some ports require and always use some non-conflicting
> >  DWARF 3 extensions in the unwind tables.
> >
> >  Version 4 may require GDB 7.0 and -fvar-tracking-assignments for
> >  maximum benefit.
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=257944

TBR=stuartmorgan@chromium.org,erg@chromium.org,mark@chromium.org,mmoss@chromium.org,thestig@chromium.org,mmoss@google.com,mithro@mithis.com
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/203683007

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@257959 0039d316-1c4b-4281-b951-d872f2087c98

Fireblend/chromium-crosswalk,jaruba/chromium.src,dednal/chromium.src,Jonekee/chromium.src,patrickm/chromium.src,ltilve/chromium,krieger-od/nwjs_chromium.src,jaruba/chromium.src,crosswalk-project/chromium-crosswalk-efl,markYoungH/chromium.src,patrickm/chromium.src,mohamed--abdel-maksoud/chromium.src,krieger-od/nwjs_chromium.src,Jonekee/chromium.src,bright-sparks/chromium-spacewalk,bright-sparks/chromium-spacewalk,Chilledheart/chromium,fujunwei/chromium-crosswalk,markYoungH/chromium.src,dushu1203/chromium.src,fujunwei/chromium-crosswalk,chuan9/chromium-crosswalk,Fireblend/chromium-crosswalk,Chilledheart/chromium,littlstar/chromium.src,PeterWangIntel/chromium-crosswalk,markYoungH/chromium.src,bright-sparks/chromium-spacewalk,Jonekee/chromium.src,fujunwei/chromium-crosswalk,Fireblend/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,mohamed--abdel-maksoud/chromium.src,ltilve/chromium,Chilledheart/chromium,Just-D/chromium-1,ltilve/chromium,Fireblend/chromium-crosswalk,ondra-novak/chromium.src,mohamed--abdel-maksoud/chromium.src,TheTypoMaster/chromium-crosswalk,M4sse/chromium.src,Fireblend/chromium-crosswalk,Chilledheart/chromium,hgl888/chromium-crosswalk-efl,dushu1203/chromium.src,hgl888/chromium-crosswalk,axinging/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,hgl888/chromium-crosswalk,patrickm/chromium.src,markYoungH/chromium.src,dushu1203/chromium.src,dednal/chromium.src,dushu1203/chromium.src,markYoungH/chromium.src,Jonekee/chromium.src,Pluto-tv/chromium-crosswalk,littlstar/chromium.src,Just-D/chromium-1,jaruba/chromium.src,Pluto-tv/chromium-crosswalk,M4sse/chromium.src,Pluto-tv/chromium-crosswalk,ondra-novak/chromium.src,crosswalk-project/chromium-crosswalk-efl,jaruba/chromium.src,ltilve/chromium,ltilve/chromium,fujunwei/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,chuan9/chromium-crosswalk,M4sse/chromium.src,mohamed--abdel-maksoud/chromium.src,hgl888/chromium-crosswalk,Just-D/chromium-1,hgl888/chromium-crosswalk-efl,crosswalk-project/chromium-crosswalk-efl,axinging/chromium-crosswalk,Jonekee/chromium.src,markYoungH/chromium.src,fujunwei/chromium-crosswalk,hgl888/chromium-crosswalk-efl,mohamed--abdel-maksoud/chromium.src,Jonekee/chromium.src,M4sse/chromium.src,krieger-od/nwjs_chromium.src,Pluto-tv/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,fujunwei/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,markYoungH/chromium.src,PeterWangIntel/chromium-crosswalk,Fireblend/chromium-crosswalk,fujunwei/chromium-crosswalk,bright-sparks/chromium-spacewalk,M4sse/chromium.src,jaruba/chromium.src,dednal/chromium.src,markYoungH/chromium.src,dushu1203/chromium.src,chuan9/chromium-crosswalk,littlstar/chromium.src,Just-D/chromium-1,M4sse/chromium.src,jaruba/chromium.src,markYoungH/chromium.src,ondra-novak/chromium.src,jaruba/chromium.src,dushu1203/chromium.src,TheTypoMaster/chromium-crosswalk,ondra-novak/chromium.src,hgl888/chromium-crosswalk,bright-sparks/chromium-spacewalk,ondra-novak/chromium.src,M4sse/chromium.src,Just-D/chromium-1,hgl888/chromium-crosswalk-efl,PeterWangIntel/chromium-crosswalk,dednal/chromium.src,M4sse/chromium.src,patrickm/chromium.src,dednal/chromium.src,PeterWangIntel/chromium-crosswalk,chuan9/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,jaruba/chromium.src,Jonekee/chromium.src,TheTypoMaster/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,krieger-od/nwjs_chromium.src,chuan9/chromium-crosswalk,bright-sparks/chromium-spacewalk,fujunwei/chromium-crosswalk,krieger-od/nwjs_chromium.src,Jonekee/chromium.src,chuan9/chromium-crosswalk,hgl888/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,ondra-novak/chromium.src,axinging/chromium-crosswalk,krieger-od/nwjs_chromium.src,dushu1203/chromium.src,axinging/chromium-crosswalk,bright-sparks/chromium-spacewalk,patrickm/chromium.src,bright-sparks/chromium-spacewalk,M4sse/chromium.src,hgl888/chromium-crosswalk,hgl888/chromium-crosswalk-efl,Chilledheart/chromium,mohamed--abdel-maksoud/chromium.src,littlstar/chromium.src,TheTypoMaster/chromium-crosswalk,chuan9/chromium-crosswalk,axinging/chromium-crosswalk,M4sse/chromium.src,Pluto-tv/chromium-crosswalk,Jonekee/chromium.src,Chilledheart/chromium,littlstar/chromium.src,chuan9/chromium-crosswalk,hgl888/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,jaruba/chromium.src,axinging/chromium-crosswalk,ltilve/chromium,littlstar/chromium.src,Chilledheart/chromium,crosswalk-project/chromium-crosswalk-efl,krieger-od/nwjs_chromium.src,Chilledheart/chromium,patrickm/chromium.src,dushu1203/chromium.src,Fireblend/chromium-crosswalk,Chilledheart/chromium,Pluto-tv/chromium-crosswalk,jaruba/chromium.src,littlstar/chromium.src,axinging/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,hgl888/chromium-crosswalk,ondra-novak/chromium.src,markYoungH/chromium.src,Pluto-tv/chromium-crosswalk,Jonekee/chromium.src,Just-D/chromium-1,jaruba/chromium.src,dednal/chromium.src,ondra-novak/chromium.src,dednal/chromium.src,ltilve/chromium,Just-D/chromium-1,Just-D/chromium-1,markYoungH/chromium.src,krieger-od/nwjs_chromium.src,ondra-novak/chromium.src,axinging/chromium-crosswalk,dushu1203/chromium.src,patrickm/chromium.src,PeterWangIntel/chromium-crosswalk,hgl888/chromium-crosswalk-efl,littlstar/chromium.src,axinging/chromium-crosswalk,ltilve/chromium,dushu1203/chromium.src,hgl888/chromium-crosswalk,dushu1203/chromium.src,TheTypoMaster/chromium-crosswalk,hgl888/chromium-crosswalk-efl,PeterWangIntel/chromium-crosswalk,bright-sparks/chromium-spacewalk,dednal/chromium.src,axinging/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,Fireblend/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,Pluto-tv/chromium-crosswalk,krieger-od/nwjs_chromium.src,M4sse/chromium.src,TheTypoMaster/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,ltilve/chromium,Pluto-tv/chromium-crosswalk,Jonekee/chromium.src,hgl888/chromium-crosswalk-efl,Just-D/chromium-1,PeterWangIntel/chromium-crosswalk,Fireblend/chromium-crosswalk,patrickm/chromium.src,krieger-od/nwjs_chromium.src,hgl888/chromium-crosswalk-efl,TheTypoMaster/chromium-crosswalk,dednal/chromium.src,krieger-od/nwjs_chromium.src,hgl888/chromium-crosswalk-efl,fujunwei/chromium-crosswalk,chuan9/chromium-crosswalk,axinging/chromium-crosswalk,dednal/chromium.src,TheTypoMaster/chromium-crosswalk,dednal/chromium.src,patrickm/chromium.src