GitLab

This contains fixes for the following sorts of issues:
* Assignment inside conditional
* Possibly-uninitialized local variable
* Signedness mismatch

This also contains a small number of other cleanups/simplifications to nearby
code.

BUG=81439
TEST=none
R=teravest@chromium.org

Review URL: https://codereview.chromium.org/375133003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282133 0039d316-1c4b-4281-b951-d872f2087c98