Enable stricter pylint checks.

The webkitpy presubmit only checks modified lines, so if we enable some pylint checks that the codebase doesn't currently conform to, that will be OK -- this just means that as code is edited in the future, it can slowly be changed to pass these checks, and we can refine the pylint checks over time.

BUG=598897

Review-Url: https://codereview.chromium.org/2120083002
Cr-Commit-Position: refs/heads/master@{#407816}
1 file changed