Remove ScrollableArea::notifyScrollPositionChanged and cleanup scroll animators.

Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 3347 matching lines @@
 {
     page()->frameHost().pinchViewport().reset();
 
     if (!page()->mainFrame()->isLocalFrame())
         return;
 
     if (FrameView* frameView = toLocalFrame(page()->mainFrame())->view()) {
         ScrollableArea* scrollableArea = frameView->layoutViewportScrollableArea();
 
         if (scrollableArea->scrollPositionDouble() != DoublePoint::zero())
-            scrollableArea->notifyScrollPositionChanged(DoublePoint::zero());
+            scrollableArea->setScrollPosition(DoublePoint::zero(), ProgrammaticScroll);
     }
 
     pageScaleConstraintsSet().setNeedsReset(true);
 
     // Clobber saved scales and scroll offsets.
     if (FrameView* view = page()->deprecatedLocalMainFrame()->document()->view())
         view->cacheCurrentScrollPosition();
 }
 
 void WebViewImpl::performMediaPlayerAction(const WebMediaPlayerAction& action,
@@ skipping 847 matching lines @@
         m_doubleTapZoomPending = false;
 
     frameView->setElasticOverscroll(elasticOverscrollDelta + frameView->elasticOverscroll());
 
     ScrollableArea* layoutViewport = frameView->layoutViewportScrollableArea();
 
     DoublePoint layoutViewportPosition = layoutViewport->scrollPositionDouble()
         + DoubleSize(layoutViewportDelta.width, layoutViewportDelta.height);
 
     if (layoutViewport->scrollPositionDouble() != layoutViewportPosition) {
-        layoutViewport->notifyScrollPositionChanged(layoutViewportPosition);
+        layoutViewport->setScrollPosition(layoutViewportPosition, CompositorScroll);
         frameView->setWasScrolledByUser(true);
     }
 }
 
 void WebViewImpl::recordFrameTimingEvent(FrameTimingEventType eventType, int64_t FrameId, const WebVector<WebFrameTimingEvent>& events)
 {
     Frame* frame = m_page ? m_page->mainFrame() : 0;
 
     while (frame && frame->frameID() != FrameId) {
         frame = frame->tree().traverseNext();
@@ skipping 164 matching lines @@
 {
     WebGLRenderingContext::forceNextWebGLContextCreationToFail();
 }
 
 void WebViewImpl::forceNextDrawingBufferCreationToFail()
 {
     DrawingBuffer::forceNextDrawingBufferCreationToFail();
 }
 
 } // namespace blink