cc: Remove unnecessary "default" cases from switch statements.

cc/trees/layer_tree_impl.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/trees/layer_tree_impl.h"
 
 #include "base/debug/trace_event.h"
 #include "cc/animation/keyframed_animation_curve.h"
 #include "cc/animation/scrollbar_animation_controller.h"
 #include "cc/debug/traced_value.h"
@@ skipping 598 matching lines @@
     UIResourceRequest req = ui_resource_request_queue_.front();
     ui_resource_request_queue_.pop_front();
 
     switch (req.type) {
       case UIResourceRequest::UIResourceCreate:
         layer_tree_host_impl_->CreateUIResource(req.id, req.bitmap);
         break;
       case UIResourceRequest::UIResourceDelete:
         layer_tree_host_impl_->DeleteUIResource(req.id);
         break;
-      default:
+      case UIResourceRequest::UIResourceInvalidRequest:
         NOTREACHED();
         break;
     }
   }
 }
 
 void LayerTreeImpl::AddLayerWithCopyOutputRequest(LayerImpl* layer) {
   // Only the active tree needs to know about layers with copy requests, as
   // they are aborted if not serviced during draw.
   DCHECK(IsActiveTree());
@@ skipping 20 matching lines @@
 const std::vector<LayerImpl*> LayerTreeImpl::LayersWithCopyOutputRequest()
     const {
   // Only the active tree needs to know about layers with copy requests, as
   // they are aborted if not serviced during draw.
   DCHECK(IsActiveTree());
 
   return layers_with_copy_output_request_;
 }
 
 }  // namespace cc