Remove null layer_tree_host() checks in ThreadProxy.

cc/trees/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/thread_proxy.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/auto_reset.h"
@@ skipping 692 matching lines @@
       impl().layer_tree_host_id);
   impl().timing_history.DidBeginMainFrame();
 }
 
 void ThreadProxy::BeginMainFrame(
     scoped_ptr<BeginMainFrameAndCommitState> begin_main_frame_state) {
   TRACE_EVENT0("cc", "ThreadProxy::BeginMainFrame");
   TRACE_EVENT_SYNTHETIC_DELAY_BEGIN("cc.BeginMainFrame");
   DCHECK(IsMainThread());
 
-  if (!layer_tree_host())
-    return;
-
   if (main().defer_commits) {
     main().pending_deferred_commit = begin_main_frame_state.Pass();
     layer_tree_host()->DidDeferCommit();
     TRACE_EVENT_INSTANT0(
         "cc", "EarlyOut_DeferCommits", TRACE_EVENT_SCOPE_THREAD);
     return;
   }
 
   // If the commit finishes, LayerTreeHost will transfer its swap promises to
   // LayerTreeImpl. The destructor of SwapPromiseChecker checks LayerTressHost's
@@ skipping 453 matching lines @@
   impl().layer_tree_host_impl->ResetCurrentFrameTimeForNextFrame();
 }
 
 void ThreadProxy::ReadyToFinalizeTextureUpdates() {
   DCHECK(IsImplThread());
   impl().scheduler->NotifyReadyToCommit();
 }
 
 void ThreadProxy::DidCommitAndDrawFrame() {
   DCHECK(IsMainThread());
-  if (!layer_tree_host())
-    return;
   layer_tree_host()->DidCommitAndDrawFrame();
 }
 
 void ThreadProxy::DidCompleteSwapBuffers() {
   DCHECK(IsMainThread());
-  if (!layer_tree_host())
-    return;
   layer_tree_host()->DidCompleteSwapBuffers();
 }
 
 void ThreadProxy::SetAnimationEvents(scoped_ptr<AnimationEventsVector> events) {
   TRACE_EVENT0("cc", "ThreadProxy::SetAnimationEvents");
   DCHECK(IsMainThread());
-  if (!layer_tree_host())
-    return;
   layer_tree_host()->SetAnimationEvents(events.Pass());
 }
 
 void ThreadProxy::CreateAndInitializeOutputSurface() {
   TRACE_EVENT0("cc", "ThreadProxy::CreateAndInitializeOutputSurface");
   DCHECK(IsMainThread());
 
   // Check that output surface has not been recreated by CompositeAndReadback
   // after this task is posted but before it is run.
   bool has_initialized_output_surface = true;
@@ skipping 291 matching lines @@
 
   impl().timing_history.DidActivatePendingTree();
 }
 
 void ThreadProxy::DidManageTiles() {
   DCHECK(IsImplThread());
   impl().scheduler->DidManageTiles();
 }
 
 }  // namespace cc