Take 3 at turning on -Werror.  This passed the last run on the buildbots, except for the valgrind bots which use -O1.  For now, just disable -Werror on the bots with an override.
Take 3 at turning on -Werror.  This passed the last run on the
buildbots, except for the valgrind bots which use -O1.  For now,
just disable -Werror on the bots with an override.

Review URL: http://codereview.chromium.org/100087


git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@14695 0039d316-1c4b-4281-b951-d872f2087c98

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