Most of them are style issues or variable aliasing.

TEST=Can almost enable pylint warnings
BUG=none

Review URL: http://codereview.chromium.org/4360002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@64908 0039d316-1c4b-4281-b951-d872f2087c98