Remove BackingStoreGtk::CairoShowRect().

This method is not called anywhere since r112787, so remove the dead code.

BUG=

Review URL: https://chromiumcodereview.appspot.com/16958009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@206711 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed