[GTK][AC] Use new Clutter APIs instead of deprecated APIs
https://bugs.webkit.org/show_bug.cgi?id=105736

Reviewed by Gustavo Noronha Silva.

Source/WebCore:

ClutterCairoTexture class and several APIs have been deprecated since version 1.10,
so ClutterCanvas and ClutterContent should be used instead of ClutterCairoTexture.
clutter_actor_add_child should be used instead of clutter_actor_set_parent and clutter_container_add_clutter.

* platform/graphics/clutter/GraphicsLayerActor.cpp:
(_GraphicsLayerActorPrivate):
(graphics_layer_actor_init):
(graphicsLayerActorDispose):
(graphicsLayerActorAllocate):
(graphicsLayerActorPaint):
(graphicsLayerActorDraw):
(graphicsLayerActorUpdateTexture):
(graphicsLayerActorNew):
(graphicsLayerActorRemoveAll):
(graphicsLayerActorInvalidateRectangle):
(graphicsLayerActorInsertSublayer):
(graphicsLayerActorSetSublayers):

Source/WebKit/gtk:

Use clutter_actor_set_background_color instead of clutter_stage_set_color.
Use clutter_actor_add_child instead of clutter_container_add_actor.
Remove clutter_actor_show_all because Actors are visible by default.

* WebCoreSupport/AcceleratedCompositingContextClutter.cpp:
(WebKit::AcceleratedCompositingContext::setRootCompositingLayer):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@140896 268f45cc-cd09-0410-ab3c-d52691b4dbfc