cc: Switch to Chromium DCHECKs LOGs

cc/tree_synchronizer.cc

 // Copyright 2011 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 "cc/tree_synchronizer.h"
 
 #include "CCLayerImpl.h"
 #include "CCScrollbarAnimationController.h"
@@ skipping 82 matching lines @@
 
     ScrollbarLayerChromium* scrollbarLayer = layer->toScrollbarLayerChromium();
     if (!scrollbarLayer)
         return;
 
     RawPtrCCLayerImplMap::const_iterator iter = newLayers.find(scrollbarLayer->id());
     CCScrollbarLayerImpl* ccScrollbarLayerImpl = iter != newLayers.end() ? static_cast<CCScrollbarLayerImpl*>(iter->second) : NULL;
     iter = newLayers.find(scrollbarLayer->scrollLayerId());
     CCLayerImpl* ccScrollLayerImpl = iter != newLayers.end() ? iter->second : NULL;
 
-    ASSERT(ccScrollbarLayerImpl);
-    ASSERT(ccScrollLayerImpl);
+    DCHECK(ccScrollbarLayerImpl);
+    DCHECK(ccScrollLayerImpl);
 
     if (ccScrollbarLayerImpl->orientation() == WebKit::WebScrollbar::Horizontal)
         ccScrollLayerImpl->setHorizontalScrollbarLayer(ccScrollbarLayerImpl);
     else
         ccScrollLayerImpl->setVerticalScrollbarLayer(ccScrollbarLayerImpl);
 }
 
 } // namespace cc