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The flag is guarded by treat_warnings_as_errors=false so that it
will apply only to local developer builds.

Results from //tools/android/build_speed/benchmark.py base_java_sig:
With change:
base_java_sig: 68.0s avg (68.8s, 67.2s)
base_java_sig: 68.4s avg (68.6s, 68.2s)

Without change:
base_java_sig: 69.4s avg (69.3s, 69.5s)
base_java_sig: 69.7s avg (69.7s, 69.7s)

time out/Debug/bin/run_base_junit_tests:
With Change:
real 0m22.741s
real 0m23.543s

Without change:
real 0m23.176s
real 0m24.328s

Bug: 1117222
Change-Id: I4bfd742165468bf9538e6fa0dc8f35daa9e0f23f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2313299
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799285}