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

Source/core/testing/Internals.cpp

Index: Source/core/testing/Internals.cpp
diff --git a/Source/core/testing/Internals.cpp b/Source/core/testing/Internals.cpp
index c34d40c85fd6747ac9c88e5532027fc58a0e4329..793b05f67c7f6480643eceafb7845cd1177cff32 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -1364,11 +1364,9 @@ PassRefPtr<LayerRectList> Internals::touchEventTargetLayerRects(Document* docume
         return 0;
     }
 
-    // Do any pending layout and compositing update (which may call touchEventTargetRectsChange) to ensure this
+    // Do any pending layouts (which may call touchEventTargetRectsChange) to ensure this
     // really takes any previous changes into account.
-    forceCompositingUpdate(document, es);
-    if (es.hadException())
-        return 0;
+    document->updateLayout();
 
     if (RenderView* view = document->renderView()) {
         if (RenderLayerCompositor* compositor = view->compositor()) {
@@ -1829,12 +1827,6 @@ String Internals::mainThreadScrollingReasons(Document* document, ExceptionState&
         return String();
     }
 
-    // Force a re-layout and a compositing update.
-    document->updateLayout();
-    RenderView* view = document->renderView();
-    if (view->compositor())
-        view->compositor()->updateCompositingLayers(CompositingUpdateFinishAllDeferredWork);
-
     Page* page = document->page();
     if (!page)
         return String();
@@ -2262,18 +2254,4 @@ bool Internals::loseSharedGraphicsContext3D()
     return true;
 }
 
-void Internals::forceCompositingUpdate(Document* document, ExceptionState& es)
-{
-    if (!document || !document->renderView()) {
-        es.throwUninformativeAndGenericDOMException(InvalidAccessError);
-        return;
-    }
-
-    document->updateLayout();
-
-    RenderView* view = document->renderView();
-    if (view->compositor())
-        view->compositor()->updateCompositingLayers(CompositingUpdateFinishAllDeferredWork);
-}
-
 }