Move remaining Blimp feature code to core.

blimp/client/core/contents/blimp_contents_view_aura.cc

 // Copyright 2016 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 "blimp/client/core/contents/blimp_contents_view_aura.h"
 
 #include "base/memory/ptr_util.h"
+#include "cc/layers/layer.h"
 
 namespace blimp {
 namespace client {
 
 // static
 std::unique_ptr<BlimpContentsView> BlimpContentsView::Create(
-    BlimpContentsImpl* blimp_contents) {
+    BlimpContentsImpl* blimp_contents,
+    scoped_refptr<cc::Layer> contents_layer) {
   return base::MakeUnique<BlimpContentsViewAura>();
 }
 
 BlimpContentsViewAura::BlimpContentsViewAura() {}
 
 gfx::NativeView BlimpContentsViewAura::GetNativeView() {
   return nullptr;
 }
 
 }  // namespace client
 }  // namespace blimp