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This is useful e.g. to limit a set of allowed or temporarily-allowed
include rules to test files, or to allow certain includes in .cc files
but not in .h files.

BUG=138280


Review URL: https://chromiumcodereview.appspot.com/10823271

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151301 0039d316-1c4b-4281-b951-d872f2087c98