Revert of Stop using -Wno-sentinel with clang. (https://codereview.chromium.org/
427723005/)
Reason for revert:
breaks Google Chrome Linux
http://build.chromium.org/p/chromium.chrome/builders/Google%20Chrome%20Linux/builds/36758/steps/compile/logs/stdio
Original issue's description:
> Stop using -Wno-sentinel with clang.
>
> Clang works fine with -Wsentinel on 32bit linux these days.
>
> BUG=162818
>
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287061
TBR=dmikurube@chromium.org,thakis@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=162818
Review URL: https://codereview.chromium.org/
431393002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287078 0039d316-1c4b-4281-b951-d872f2087c98