Fix presubmit checks so that we lint the TestExpectations files more often.
Fix presubmit checks so that we lint the TestExpectations files more often.

We were only checking for lint errors when we modified the TestExpectations
files themselves; however, it is possible for changes to other files under
LayoutTests/ to also introduce errors, so we should run the check more often.
Fortunately, linting the files is pretty fast.

R=jchaffraix@chromium.org
BUG=

Review URL: https://codereview.chromium.org/14130016

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@148504 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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