Revert 120033 - GeneratorGeneratedImage should cache images for the non-tiled case

Revert 120033 - GeneratorGeneratedImage should cache images for the non-tiled case
https://bugs.webkit.org/show_bug.cgi?id=87094

Patch by Jin Yang <jin.a.yang@intel.com>; on 2012-06-11
Reviewed by Simon Fraser.

Source/WebCore:

We cache the generated image if generator is not changed. By compared
with generating image on the fly, it will lose a little pixel precision
and several layout tests should be rebaselined. With this patch, the IE test
drive benchmark "Bayou" can gain about 50%.

No new tests. Performance optimization.

* platform/graphics/GeneratorGeneratedImage.cpp:
(WebCore::GeneratorGeneratedImage::draw):

LayoutTests:

Update expectations: added failures for baselines to come.

* platform/chromium/TestExpectations:

TBR=commit-queue@webkit.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=122784