media/win: Make TypeEnumerator FINAL.
media/win: Make TypeEnumerator FINAL.

Fixes this warning:

In file included from ..\..\media/video/capture/win/pin_base_win.h:15:
..\..\base/memory/ref_counted.h(131,7) :  warning(clang): delete called on 'const media::TypeEnumerator' that has virtual functions but non-virtual destructor [-Wdelete-non-virtual-dtor]
      delete static_cast<const T*>(this);
      ^
..\..\media\video\capture\win\pin_base_win.cc(40,39) :  note(clang): in instantiation of member function 'base::RefCounted<media::TypeEnumerator>::Release' requested here
    base::RefCounted<TypeEnumerator>::Release();
                                      ^
1 warning generated.

BUG=82385
NOTRY=true

Review URL: https://codereview.chromium.org/410833002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@284982 0039d316-1c4b-4281-b951-d872f2087c98

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