[TexMap] Remove m_size in TextureMapperLayer.
https://bugs.webkit.org/show_bug.cgi?id=105781

Patch by Huang Dongsung <luxtella@company100.net> on 2013-01-02
Reviewed by Noam Rosenthal.

m_size is duplicated by State::size, so this patch removes it.

No new tests. Refactoring only.

* platform/graphics/texmap/TextureMapperLayer.cpp:
(WebCore::TextureMapperLayer::computeTransformsRecursive):
(WebCore::TextureMapperLayer::paintSelf):
(WebCore::TextureMapperLayer::isVisible):
(WebCore::TextureMapperLayer::flushCompositingStateForThisLayerOnly):
* platform/graphics/texmap/TextureMapperLayer.h:
(WebCore::TextureMapperLayer::layerRect):
(TextureMapperLayer):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@138695 268f45cc-cd09-0410-ab3c-d52691b4dbfc