Reviewed by Eric. Rubber stamped by Oliver.

Reviewed by Eric. Rubber stamped by Oliver.

Fixes: http://bugs.webkit.org/show_bug.cgi?id=10383
This is the final patch after the long "die kcanvas" journey.

All old kcanvas code is gone now, and properly integrated within
WebCore (stuff like GraphicsContext changes etc.). It shares
the platform/ design concept: no subclassing, but instead
implementing parts of the classes/methods per-platform.

This commit removes the last pieces: KRenderingDevice & KRenderingDeviceContext.
This layer was just obsolete, given the powerful GraphicsContext API we have
since quite a while now. All the ugly pushContext/popContext stuff is gone now.

The naming issues Cg vs. CG will be fixed in one shot, when moving the whole
platform/graphics/svg directory down into ksvg2/graphics - as discussed with Darin.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@17947 268f45cc-cd09-0410-ab3c-d52691b4dbfc