s/scheduleLayerUpdate/setNeedsCompositingUpdate in setWebLayer.

This was added in http://src.chromium.org/viewvc/blink?view=revision&revision=80584.
It didn't have tests, so I'm not sure how to test this.
But plugins always have a RenderLayer, so there should be no
need to schedule a layer update anymore.

Review URL: https://codereview.chromium.org/318773003

git-svn-id: svn://svn.chromium.org/blink/trunk@175597 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/web/WebPluginContainerImpl.cpp

@@ -291,7 +291,7 @@ void WebPluginContainerImpl::setWebLayer(WebLayer* layer)
     // If anyone of the layers is null we need to switch between hardware
     // and software compositing.
     if (!m_webLayer || !layer)
-        m_element->scheduleLayerUpdate();
+        m_element->setNeedsCompositingUpdate();
     if (m_webLayer)
         GraphicsLayer::unregisterContentsLayer(m_webLayer);
     if (layer)