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This functions is not called anymore in Blink and thus it has no effect
here in Chromium. So no need to keep overriding it.

This also deletes web_solid_color_layer_impl.* because it becomes unused with this change.

BUG=None
TEST=None
R=enne@chromium.org

Review URL: https://codereview.chromium.org/431273002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288125 0039d316-1c4b-4281-b951-d872f2087c98