[Qt] Get rid of GraphicsLayerQt

[Qt] Get rid of GraphicsLayerQt
https://bugs.webkit.org/show_bug.cgi?id=78598

Reviewed by Luiz Agostini.

Source/WebCore:

Remove GraphicsLayerQt.h/cpp, as well as references to the non-TextureMapper code paths
in GraphicsContext3DQt and MediaPlayerPrivateQt.

No new tests, removing unused code paths.

* Target.pri:
* platform/graphics/PlatformLayer.h:
* platform/graphics/qt/GraphicsContext3DQt.cpp:
(GraphicsContext3DPrivate):
(WebCore):
* platform/graphics/qt/GraphicsContextQt.cpp:
(WebCore):
* platform/graphics/qt/GraphicsLayerQt.cpp: Removed.
* platform/graphics/qt/GraphicsLayerQt.h: Removed.
* platform/graphics/qt/MediaPlayerPrivateQt.cpp:
(WebCore):
* platform/graphics/qt/MediaPlayerPrivateQt.h:
(MediaPlayerPrivateQt):
* plugins/qt/PluginViewQt.cpp:
(WebCore::PluginView::invalidateRect):
(WebCore::PluginView::platformStart):

Source/WebKit/qt:

Removed all references to GraphicsLayerQt, including #ifdef code paths that only apply
when TEXTURE_MAPPER is disabled.

* Api/qgraphicswebview.cpp:
(QGraphicsWebView::paint):
* Api/qwebframe.cpp:
(QWebFramePrivate::renderFromTiledBackingStore):
(QWebFramePrivate::renderRelativeCoords):
* Api/qwebframe_p.h:
(QWebFramePrivate::QWebFramePrivate):
(QWebFramePrivate):
* Api/qwebsettings.cpp:
(QWebSettingsPrivate::apply):
* WebCoreSupport/PageClientQt.cpp:
(WebCore):
(WebCore::PageClientQGraphicsWidget::~PageClientQGraphicsWidget):
(WebCore::PageClientQGraphicsWidget::update):
(WebCore::PageClientQGraphicsWidget::syncLayers):
(WebCore::PageClientQGraphicsWidget::setRootGraphicsLayer):
* WebCoreSupport/PageClientQt.h:
(WebCore):
(WebCore::PageClientQWidget::PageClientQWidget):
(PageClientQWidget):
(PageClientQGraphicsWidget):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121710 268f45cc-cd09-0410-ab3c-d52691b4dbfc