GitLab

This patch removes layers that are no longer have their tile priorities
updated from tile manager, in order to ensure that we don't process
tile or use any other information from these layers.

BUG=176557
R=enne

Review URL: https://codereview.chromium.org/279543003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@270247 0039d316-1c4b-4281-b951-d872f2087c98