Remove call to updateLayerCompositingState in RenderLayer::contentChanged

This call site was already trigginer a CompositingUpdateAfterCompositingInputChange.
Calling updateLayerCompositingState could upgrade to CompositingUpdateRebuildTree,
but there's no reason to do that eagerly. We compute whether that upgrade is
necessary during the compositing update itself.

BUG=343756

Review URL: https://codereview.chromium.org/327963005

git-svn-id: svn://svn.chromium.org/blink/trunk@175939 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/rendering/RenderLayer.cpp

@@ -201,10 +201,8 @@ void RenderLayer::contentChanged(ContentChangeType changeType)
     DisableCompositingQueryAsserts disabler;
 
     // This can get called when video becomes accelerated, so the layers may change.
-    if (changeType == CanvasChanged || changeType == VideoChanged || changeType == FullScreenChanged) {
-        compositor()->updateLayerCompositingState(this);
+    if (changeType == CanvasChanged || changeType == VideoChanged || changeType == FullScreenChanged)
         compositor()->setNeedsCompositingUpdate(CompositingUpdateAfterCompositingInputChange);
-    }
 
     if (changeType == CanvasContextChanged) {
         compositor()->setNeedsCompositingUpdate(CompositingUpdateAfterCompositingInputChange);