cc: Move SyncedScrollOffset to scroll tree

cc/layers/picture_image_layer_impl.cc

 // Copyright 2013 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/layers/picture_image_layer_impl.h"
 
 #include <algorithm>
 
 #include "cc/debug/debug_colors.h"
 #include "cc/trees/layer_tree_impl.h"
 
 namespace cc {
 
 PictureImageLayerImpl::PictureImageLayerImpl(LayerTreeImpl* tree_impl,
                                              int id,
                                              bool is_mask)
-    : PictureLayerImpl(tree_impl,
-                       id,
-                       is_mask,
-                       new LayerImpl::SyncedScrollOffset) {
-}
+    : PictureLayerImpl(tree_impl, id, is_mask) {}
 
 PictureImageLayerImpl::~PictureImageLayerImpl() {
 }
 
 const char* PictureImageLayerImpl::LayerTypeAsString() const {
   return "cc::PictureImageLayerImpl";
 }
 
 scoped_ptr<LayerImpl> PictureImageLayerImpl::CreateLayerImpl(
     LayerTreeImpl* tree_impl) {
@@ skipping 22 matching lines @@
 }
 
 void PictureImageLayerImpl::UpdateIdealScales() {
   ideal_contents_scale_ = 1.f;
   ideal_page_scale_ = 1.f;
   ideal_device_scale_ = 1.f;
   ideal_source_scale_ = 1.f;
 }
 
 }  // namespace cc