Temporarily disable -Werror in Chromium.

Temporarily disable the use of -Werror in the AOSP copy of Chromium so
that the system-wide default warnings can be changed without breaking
Chromium. We'll re-enable it once the warnings are settled and we've
fixed any issues.

Bug: 18632512
Change-Id: I1d21c016fc0f225cd7833436d1f560b764eeab5a
144 files changed