cc: Remove invalidation history

cc/resources/display_list_recording_source.cc

 // Copyright 2014 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/resources/display_list_recording_source.h"
 
 #include <algorithm>
 
 #include "cc/base/region.h"
 #include "cc/layers/content_layer_client.h"
@@ skipping 105 matching lines @@
   DetermineIfSolidColor();
   display_list_->EmitTraceSnapshot();
 
   display_list_->CreateAndCacheSkPicture();
   if (gather_pixel_refs_)
     display_list_->GatherPixelRefs(grid_cell_size_);
 
   return true;
 }
 
-void DisplayListRecordingSource::DidMoveToNewCompositor() {
-  // No invalidation history to worry about here.
-}
-
 gfx::Size DisplayListRecordingSource::GetSize() const {
   return size_;
 }
 
 void DisplayListRecordingSource::SetEmptyBounds() {
   size_ = gfx::Size();
   Clear();
 }
 
 void DisplayListRecordingSource::SetSlowdownRasterScaleFactor(int factor) {
@@ skipping 45 matching lines @@
   is_solid_color_ = canvas.GetColorIfSolid(&solid_color_);
 }
 
 void DisplayListRecordingSource::Clear() {
   recorded_viewport_ = gfx::Rect();
   display_list_ = NULL;
   is_solid_color_ = false;
 }
 
 }  // namespace cc