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

cc/output/direct_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/direct_renderer.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/containers/hash_tables.h"
@@ skipping 351 matching lines @@
 
     bool has_external_stencil_test =
         output_surface_->HasExternalStencilTest() &&
         frame->current_render_pass == frame->root_render_pass;
 
     DiscardPixels(has_external_stencil_test, draw_rect_covers_full_surface);
     ClearFramebuffer(frame, has_external_stencil_test);
   }
 
   const QuadList& quad_list = render_pass->quad_list;
-  for (QuadList::ConstBackToFrontIterator it = quad_list.BackToFrontBegin();
-       it != quad_list.BackToFrontEnd();
+  for (auto it = quad_list.BackToFrontBegin(); it != quad_list.BackToFrontEnd();
        ++it) {
-    const DrawQuad& quad = *it;
+    const DrawQuad& quad = **it;
     bool should_skip_quad = false;
 
     if (using_scissor_as_optimization) {
       SetScissorStateForQuadWithRenderPassScissor(
           frame, quad, render_pass_scissor, &should_skip_quad);
     } else {
       SetScissorStateForQuad(frame, quad);
     }
 
     if (!should_skip_quad)
@@ skipping 34 matching lines @@
   ScopedResource* texture = render_pass_textures_.get(id);
   return texture && texture->id();
 }
 
 // static
 gfx::Size DirectRenderer::RenderPassTextureSize(const RenderPass* render_pass) {
   return render_pass->output_rect.size();
 }
 
 }  // namespace cc