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Makes the following changes to //content/test/gpu:
1. Adds an explanation for why too-few-public-methods shouldn't be
   removed.
2. Removes the general broad-except disable and inline disables it
   in the few valid use cases we have.
3. Removes the general too-many-branches disable and inline disables or
   fixes the resulting errors.

Bug: 1076144
Change-Id: If357e34f3e935464db54136b87f7c260ba4e5e22
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2303597Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789680}