Rename some resource files for clarity, or to fit better with upcoming theme resources.  Does not rename the identifiers yet, so as to minimize code change.

BUG=50107
TEST=none
Review URL: http://codereview.chromium.org/3035033

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@53886 0039d316-1c4b-4281-b951-d872f2087c98