GitLab

In class method (not instance methods), we shouldn't use this because 'this' indicates not "instance" but "class" itself.

BUG=175657
TEST=Files.app launches. 
TBR=mtomasz@chromium.org, haruki@chromium.org

Review URL: https://chromiumcodereview.appspot.com/12257002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182222 0039d316-1c4b-4281-b951-d872f2087c98