cc: Remove the software compositing bool from PrepareTextureMailbox

ui/compositor/layer.cc

 // Copyright (c) 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 "ui/compositor/layer.h"
 
 #include <algorithm>
 #include <memory>
 #include <utility>
 
@@ skipping 804 matching lines @@
 bool Layer::FillsBoundsCompletely() const { return fills_bounds_completely_; }
 
 size_t Layer::GetApproximateUnsharedMemoryUsage() const {
   // Most of the "picture memory" is shared with the cc::DisplayItemList, so
   // there's nothing significant to report here.
   return 0;
 }
 
 bool Layer::PrepareTextureMailbox(
     cc::TextureMailbox* mailbox,
-    std::unique_ptr<cc::SingleReleaseCallback>* release_callback,
-    bool use_shared_memory) {
+    std::unique_ptr<cc::SingleReleaseCallback>* release_callback) {
   if (!mailbox_release_callback_)
     return false;
   *mailbox = mailbox_;
   *release_callback = std::move(mailbox_release_callback_);
   return true;
 }
 
 class LayerDebugInfo : public base::trace_event::ConvertableToTraceFormat {
  public:
   explicit LayerDebugInfo(const std::string& name) : name_(name) {}
@@ skipping 258 matching lines @@
   if (animator_) {
     animator_->ResetCompositor(compositor);
     animator_->RemoveFromCollection(collection);
   }
 
   for (auto* child : children_)
     child->ResetCompositorForAnimatorsInTree(compositor);
 }
 
 }  // namespace ui