Selecting 'alt+left arrow' key in PDF does not move to previous url page. similarly 'alt+right arrow' key in PDF does not move to next url page.
Selecting 'alt+left arrow' key in PDF does not move to previous url page. similarly 'alt+right arrow' key in PDF does not move to next url page.

Currently alt+arrow, ctrl+arrow,shift+arrow work like when
user select just arrow key, so with in the pdf file movement happen.
That is wrong.
It should be like:
1.Page should move up with in PDF when
 -Selecting Shift+Spacebar.
 -Selecting Pageup key.
 -Selecting only Left Arrow Key.
2.Page should move down with in PDF when
 -Selecting Spacebar.
 -Selecting Pagedown key.
 -Selecting only Right Arrow Key.

Changes added so that alt+ arrow key should have default behavior
that is moving to previous or next url.

BUG=75089

Review URL: https://codereview.chromium.org/802083002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#308511}

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