Remove variants block.

No existing gyp generator looks at this. (scons used to, but it hasn't been
in use in over 3 years.)

No behavior change.

BUG=none
R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/27360002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228730 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228730
Update LayerTreeHostFiltersPixelTest to the new SkImageFilter CropRect API.

BUG=229910

Review URL: https://codereview.chromium.org/26179008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228731 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228731