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It seems this file doesn't exist anymore, so the exclusion
rules aren't also necessary. And GN reports error for 
excluding non-existing files.

BUG=None
R=brettw@chromium.org, szym@chromium.org
TEST=None

Review URL: https://codereview.chromium.org/399723002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@283655 0039d316-1c4b-4281-b951-d872f2087c98