Revert 277208 "[PPAPI] Compositor API implementation."

ppapi/host/resource_host.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 "ppapi/host/resource_host.h"
 
 #include "base/logging.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/host/ppapi_host.h"
 #include "ppapi/host/resource_message_filter.h"
@@ skipping 30 matching lines @@
   DCHECK(!pp_resource_);
   pp_resource_ = pp_resource;
   DidConnectPendingHostToResource();
 }
 
 void ResourceHost::SendReply(const ReplyMessageContext& context,
                              const IPC::Message& msg) {
   host_->SendReply(context, msg);
 }
 
-bool ResourceHost::IsCompositorHost() {
-  return false;
-}
-
 bool ResourceHost::IsFileRefHost() {
   return false;
 }
 
 bool ResourceHost::IsFileSystemHost() {
   return false;
 }
 
 bool ResourceHost::IsMediaStreamVideoTrackHost() {
   return false;
 }
 
 bool ResourceHost::IsGraphics2DHost() {
   return false;
 }
 
 void ResourceHost::AddFilter(scoped_refptr<ResourceMessageFilter> filter) {
   message_filters_.push_back(filter);
   filter->OnFilterAdded(this);
 }
 
 }  // namespace host
 }  // namespace ppapi