GitLab

Now it may always refer operation_context->file_system_context() as it tries to invalidate the usage cache whenever it finds inconsistency.

BUG=129303
TEST=none

Review URL: https://chromiumcodereview.appspot.com/10407115

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@138444 0039d316-1c4b-4281-b951-d872f2087c98