cc: Use ApplyImageFilter for all filters in GLRenderer

This makes GLRenderer always use ApplyImageFilter for
filters, and removes the now-unused ApplyFilters.

BUG=181613

Review URL: https://codereview.chromium.org/26133002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227815 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227815