cc: cleanup: Remove unnecessary DCHECK

cc/layers/layer_impl.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/layers/layer_impl.h"
 
 #include "base/debug/trace_event.h"
 #include "base/json/json_reader.h"
 #include "base/strings/stringprintf.h"
 #include "cc/animation/animation_registrar.h"
@@ skipping 1128 matching lines @@
 void LayerImpl::DidBeginTracing() {}
 
 void LayerImpl::ReleaseResources() {}
 
 gfx::Vector2d LayerImpl::MaxScrollOffset() const {
   if (!scroll_clip_layer_ || bounds().IsEmpty())
     return gfx::Vector2d();
 
   LayerImpl const* page_scale_layer = layer_tree_impl()->page_scale_layer();
   DCHECK(this != page_scale_layer);
-  DCHECK(scroll_clip_layer_);
   DCHECK(this != layer_tree_impl()->InnerViewportScrollLayer() ||
          IsContainerForFixedPositionLayers());
 
   gfx::SizeF scaled_scroll_bounds(bounds());
 
   float scale_factor = 1.f;
   for (LayerImpl const* current_layer = this;
        current_layer != scroll_clip_layer_;
        current_layer = current_layer->parent()) {
     DCHECK(current_layer);
@@ skipping 322 matching lines @@
 scoped_ptr<base::Value> LayerImpl::AsValue() const {
   scoped_ptr<base::DictionaryValue> state(new base::DictionaryValue());
   AsValueInto(state.get());
   return state.PassAs<base::Value>();
 }
 
 void LayerImpl::RunMicroBenchmark(MicroBenchmarkImpl* benchmark) {
   benchmark->RunOnLayer(this);
 }
 }  // namespace cc