Remove crash instrumentation, since we haven't seen a crash in

cc/layer_tree_host.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 "cc/layer_tree_host.h"
 
 #include "base/debug/trace_event.h"
 #include "base/message_loop.h"
 #include "cc/font_atlas.h"
 #include "cc/graphics_context.h"
@@ skipping 231 matching lines @@
 // This function commits the LayerTreeHost to an impl tree. When modifying
 // this function, keep in mind that the function *runs* on the impl thread! Any
 // code that is logically a main thread operation, e.g. deletion of a Layer,
 // should be delayed until the LayerTreeHost::commitComplete, which will run
 // after the commit, but on the main thread.
 void LayerTreeHost::finishCommitOnImplThread(LayerTreeHostImpl* hostImpl)
 {
     DCHECK(m_proxy->isImplThread());
 
     m_contentsTextureManager->updateBackingsInDrawingImplTree();
-    ResourceProvider::debugNotifyEnterZone(0xA000000);
     m_contentsTextureManager->reduceMemory(hostImpl->resourceProvider());
-    ResourceProvider::debugNotifyLeaveZone();
 
     hostImpl->setRootLayer(TreeSynchronizer::synchronizeTrees(rootLayer(), hostImpl->detachLayerTree(), hostImpl));
 
     if (m_rootLayer && m_hudLayer)
         hostImpl->setHudLayer(static_cast<HeadsUpDisplayLayerImpl*>(LayerTreeHostCommon::findLayerInSubtree(hostImpl->rootLayer(), m_hudLayer->id())));
     else
         hostImpl->setHudLayer(0);
 
     // We may have added an animation during the tree sync. This will cause both layer tree hosts
     // to visit their controllers.
@@ skipping 573 matching lines @@
             else
                 layer->notifyAnimationFinished(wallClockTime.ToDoubleT());
         }
     }
 
     for (size_t childIndex = 0; childIndex < layer->children().size(); ++childIndex)
         setAnimationEventsRecursive(events, layer->children()[childIndex].get(), wallClockTime);
 }
 
 }  // namespace cc