Update from chromium https://crrev.com/302282

cc/output/delegating_renderer.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 "cc/output/delegating_renderer.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 72 matching lines @@
   delegated_frame_data_ = make_scoped_ptr(new DelegatedFrameData);
   DelegatedFrameData& out_data = *delegated_frame_data_;
   out_data.device_scale_factor = device_scale_factor;
   // Move the render passes and resources into the |out_frame|.
   out_data.render_pass_list.swap(*render_passes_in_draw_order);
 
   // Collect all resource ids in the render passes into a ResourceIdArray.
   ResourceProvider::ResourceIdArray resources;
   DrawQuad::ResourceIteratorCallback append_to_array =
       base::Bind(&AppendToArray, &resources);
-  for (size_t i = 0; i < out_data.render_pass_list.size(); ++i) {
-    RenderPass* render_pass = out_data.render_pass_list.at(i);
-    for (auto& quad : render_pass->quad_list)
-      quad.IterateResources(append_to_array);
+  for (const auto& render_pass : out_data.render_pass_list) {
+    for (const auto& quad : render_pass->quad_list)
+      quad->IterateResources(append_to_array);
   }
   resource_provider_->PrepareSendToParent(resources, &out_data.resource_list);
 }
 
 void DelegatingRenderer::SwapBuffers(const CompositorFrameMetadata& metadata) {
   TRACE_EVENT0("cc,benchmark", "DelegatingRenderer::SwapBuffers");
   CompositorFrame compositor_frame;
   compositor_frame.metadata = metadata;
   compositor_frame.delegated_frame_data = delegated_frame_data_.Pass();
   output_surface_->SwapBuffers(&compositor_frame);
@@ skipping 15 matching lines @@
     }
   }
   // We loop visibility to the GPU process, since that's what manages memory.
   // That will allow it to feed us with memory allocations that we can act
   // upon.
   if (context_provider)
     context_provider->ContextSupport()->SetSurfaceVisible(visible());
 }
 
 }  // namespace cc