Fix remaining incompatibilities between scoped_ptr and unique_ptr.

cc/trees/single_thread_proxy.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/single_thread_proxy.h"
 
 #include "base/auto_reset.h"
 #include "base/profiler/scoped_tracker.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/animation/animation_events.h"
@@ skipping 80 matching lines @@
   TRACE_EVENT0("cc", "SingleThreadProxy::FinishAllRendering");
   DCHECK(task_runner_provider_->IsMainThread());
   {
     DebugScopedSetImplThread impl(task_runner_provider_);
     layer_tree_host_impl_->FinishAllRendering();
   }
 }
 
 bool SingleThreadProxy::IsStarted() const {
   DCHECK(task_runner_provider_->IsMainThread());
-  return layer_tree_host_impl_;
+  return !!layer_tree_host_impl_;
 }
 
 bool SingleThreadProxy::CommitToActiveTree() const {
   // With SingleThreadProxy we skip the pending tree and commit directly to the
   // active tree.
   return true;
 }
 
 void SingleThreadProxy::SetVisible(bool visible) {
   TRACE_EVENT1("cc", "SingleThreadProxy::SetVisible", "visible", visible);
@@ skipping 762 matching lines @@
       << "DidFinishImplFrame called while not inside an impl frame!";
   inside_impl_frame_ = false;
 #endif
 }
 
 void SingleThreadProxy::SendBeginFramesToChildren(const BeginFrameArgs& args) {
   layer_tree_host_->SendBeginFramesToChildren(args);
 }
 
 }  // namespace cc