Revert "Re-land deferred compositing updates with fixed assumptions"

Source/web/PageWidgetDelegate.cpp

Index: Source/web/PageWidgetDelegate.cpp
diff --git a/Source/web/PageWidgetDelegate.cpp b/Source/web/PageWidgetDelegate.cpp
index 5d001e3a3329132e09d4f90b921d4d518d407a7b..2f8aa6878ace1d5e098e3ac9bb12c67137f3b265 100644
--- a/Source/web/PageWidgetDelegate.cpp
+++ b/Source/web/PageWidgetDelegate.cpp
@@ -38,8 +38,6 @@
 #include "core/frame/Frame.h"
 #include "core/frame/FrameView.h"
 #include "core/platform/graphics/GraphicsContext.h"
-#include "core/rendering/RenderLayerCompositor.h"
-#include "core/rendering/RenderView.h"
 #include "wtf/CurrentTime.h"
 
 using namespace WebCore;
@@ -80,11 +78,6 @@ void PageWidgetDelegate::layout(Page* page)
     // setFrameRect may have the side-effect of causing existing page layout to
     // be invalidated, so layout needs to be called last.
     view->updateLayoutAndStyleIfNeededRecursive();
-
-    // For now, as we know this is the point in code where the compositor has
-    // actually asked for Blink to update the composited layer tree. So finally
-    // do all the deferred work for updateCompositingLayers() here.
-    view->renderView()->compositor()->updateCompositingLayers(CompositingUpdateFinishAllDeferredWork);
 }
 
 void PageWidgetDelegate::paint(Page* page, PageOverlayList* overlays, WebCanvas* canvas, const WebRect& rect, CanvasBackground background)