Remove old (pre-webkit) compositor

ui/gfx/compositor/compositor.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/gfx/compositor/compositor.h"
 
 #include "ui/gfx/compositor/compositor_observer.h"
 #include "ui/gfx/compositor/layer.h"
 
 namespace ui {
 
 TextureDrawParams::TextureDrawParams()
     : blend(false),
       has_valid_alpha_channel(false),
       opacity(1.0f),
       vertically_flipped(false) {
 }
 
-// static
-Compositor*(*Compositor::compositor_factory_)(CompositorDelegate*) = NULL;
-
 Compositor::Compositor(CompositorDelegate* delegate, const gfx::Size& size)
     : delegate_(delegate),
       size_(size),
       root_layer_(NULL) {
 }
 
 Compositor::~Compositor() {
   if (root_layer_)
     root_layer_->SetCompositor(NULL);
 }
@@ skipping 34 matching lines @@
 
 bool Compositor::HasObserver(CompositorObserver* observer) {
   return observer_list_.HasObserver(observer);
 }
 
 void Compositor::OnRootLayerChanged() {
   ScheduleDraw();
 }
 
 void Compositor::DrawTree() {
-  root_layer_->DrawTree();
 }
 
 bool Compositor::CompositesAsynchronously() {
   return false;
 }
 
 void Compositor::SwizzleRGBAToBGRAAndFlip(unsigned char* pixels,
                                           const gfx::Size& image_size) {
   // Swizzle from RGBA to BGRA
   size_t bitmap_size = 4 * image_size.width() * image_size.height();
@@ skipping 21 matching lines @@
   FOR_EACH_OBSERVER(CompositorObserver,
                     observer_list_,
                     OnCompositingEnded(this));
 }
 
 void Compositor::NotifyStart(bool clear) {
   OnNotifyStart(clear);
 }
 
 }  // namespace ui