[CoordinatedGraphics] Change the namespace of CoordinatedBackingStore and CoordinatedGraphicsScene
https://bugs.webkit.org/show_bug.cgi?id=139372

Reviewed by Gyuyoung Kim.

CoordinatedBackingStore and CoordinatedGraphicsScene should be declared in the WebKit namespace
instead of WebCore namespace.

* UIProcess/API/CoordinatedGraphics/WKCoordinatedScene.cpp:
* UIProcess/CoordinatedGraphics/CoordinatedBackingStore.cpp:
* UIProcess/CoordinatedGraphics/CoordinatedBackingStore.h:
(WebKit::CoordinatedBackingStoreTile::CoordinatedBackingStoreTile):
(WebKit::CoordinatedBackingStore::rect):
(WebCore::CoordinatedBackingStoreTile::CoordinatedBackingStoreTile): Deleted.
(WebCore::CoordinatedBackingStore::rect): Deleted.
* UIProcess/CoordinatedGraphics/CoordinatedGraphicsScene.cpp:
* UIProcess/CoordinatedGraphics/CoordinatedGraphicsScene.h:
(WebKit::CoordinatedGraphicsScene::setViewBackgroundColor):
(WebKit::CoordinatedGraphicsScene::viewBackgroundColor):
(WebKit::CoordinatedGraphicsScene::layerByID):
(WebKit::CoordinatedGraphicsScene::rootLayer):
(WebCore::CoordinatedGraphicsScene::setViewBackgroundColor): Deleted.
(WebCore::CoordinatedGraphicsScene::viewBackgroundColor): Deleted.
(WebCore::CoordinatedGraphicsScene::layerByID): Deleted.
(WebCore::CoordinatedGraphicsScene::rootLayer): Deleted.
* UIProcess/CoordinatedGraphics/CoordinatedLayerTreeHostProxy.h:
(WebKit::CoordinatedLayerTreeHostProxy::coordinatedGraphicsScene):
* UIProcess/CoordinatedGraphics/WKCoordinatedSceneAPICast.h:
(WebKit::toImpl):
(WebKit::toAPI):
(toImpl): Deleted.
(toAPI): Deleted.
* UIProcess/CoordinatedGraphics/WebView.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@176934 268f45cc-cd09-0410-ab3c-d52691b4dbfc