cc: Properly forward changes to resource usage limits to resource pool.

BUG=311244

Review URL: https://codereview.chromium.org/40463002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230854 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230854