cc: Remove use of PassAs() and constructor-casting with scoped_ptr.

cc/trees/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/trees/layer_tree_host.h"
 
 #include <algorithm>
 #include <stack>
 #include <string>
 
@@ skipping 148 matching lines @@
   }
 }
 
 LayerTreeHost::~LayerTreeHost() {
   TRACE_EVENT0("cc", "LayerTreeHost::~LayerTreeHost");
 
   DCHECK(swap_promise_monitor_.empty());
 
   BreakSwapPromises(SwapPromise::COMMIT_FAILS);
 
-  overhang_ui_resource_.reset();
+  overhang_ui_resource_ = nullptr;
 
   if (root_layer_.get())
     root_layer_->SetLayerTreeHost(NULL);
 
   if (proxy_) {
     DCHECK(proxy_->IsMainThread());
     proxy_->Stop();
   }
 
   // We must clear any pointers into the layer tree prior to destroying it.
@@ skipping 179 matching lines @@
 
   host_impl->SetViewportSize(device_viewport_size_);
   host_impl->SetDeviceScaleFactor(device_scale_factor_);
   host_impl->SetDebugState(debug_state_);
   if (pending_page_scale_animation_) {
     host_impl->StartPageScaleAnimation(
         pending_page_scale_animation_->target_offset,
         pending_page_scale_animation_->use_anchor,
         pending_page_scale_animation_->scale,
         pending_page_scale_animation_->duration);
-    pending_page_scale_animation_.reset();
+    pending_page_scale_animation_ = nullptr;
   }
 
   if (!ui_resource_request_queue_.empty()) {
     sync_tree->set_ui_resource_request_queue(ui_resource_request_queue_);
     ui_resource_request_queue_.clear();
   }
   if (overhang_ui_resource_) {
     host_impl->SetOverhangUIResource(
         overhang_ui_resource_->id(),
         GetUIResourceSize(overhang_ui_resource_->id()));
@@ skipping 943 matching lines @@
   swap_promise_list_.push_back(swap_promise.Pass());
 }
 
 void LayerTreeHost::BreakSwapPromises(SwapPromise::DidNotSwapReason reason) {
   for (size_t i = 0; i < swap_promise_list_.size(); i++)
     swap_promise_list_[i]->DidNotSwap(reason);
   swap_promise_list_.clear();
 }
 
 }  // namespace cc