cc: Remove wtf includes from *LayerTextureUpdater headers

cc/scrollbar_layer.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 
 #include "ScrollbarLayerChromium.h"
 
 #include "base/basictypes.h"
 #include "CCLayerTreeHost.h"
@@ skipping 159 matching lines @@
     WebKit::WebScrollbar* m_scrollbar;
     WebKit::WebScrollbarThemePainter m_painter;
     WebKit::WebScrollbarThemeGeometry* m_geometry;
 
     DISALLOW_COPY_AND_ASSIGN(ScrollbarThumbPainter);
 };
 
 void ScrollbarLayerChromium::setLayerTreeHost(CCLayerTreeHost* host)
 {
     if (!host || host != layerTreeHost()) {
-        m_backTrackUpdater.clear();
-        m_backTrack.clear();
-        m_thumbUpdater.clear();
-        m_thumb.clear();
+        m_backTrackUpdater = NULL;
+        m_backTrack.reset();
+        m_thumbUpdater = NULL;
+        m_thumb.reset();
     }
 
     LayerChromium::setLayerTreeHost(host);
 }
 
 void ScrollbarLayerChromium::createTextureUpdaterIfNeeded()
 {
     m_textureFormat = layerTreeHost()->rendererCapabilities().bestTextureFormat;
 
     if (!m_backTrackUpdater)
@@ skipping 81 matching lines @@
         updatePart(m_foreTrackUpdater.get(), m_foreTrack.get(), contentRect, queue, stats);
 
     // Consider the thumb to be at the origin when painting.
     WebKit::WebRect thumbRect = m_geometry->thumbRect(m_scrollbar.get());
     IntRect originThumbRect = layerRectToContentRect(WebKit::WebRect(0, 0, thumbRect.width, thumbRect.height));
     if (!originThumbRect.isEmpty())
         updatePart(m_thumbUpdater.get(), m_thumb.get(), originThumbRect, queue, stats);
 }
 
 }