ResizingHostObserver is created by the desktop environment together with other stubs.

remoting/host/chromoting_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 "remoting/host/chromoting_host.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/message_loop_proxy.h"
@@ skipping 249 matching lines @@
 void ChromotingHost::OnSessionRouteChange(
     ClientSession* session,
     const std::string& channel_name,
     const protocol::TransportRoute& route) {
   DCHECK(network_task_runner_->BelongsToCurrentThread());
   FOR_EACH_OBSERVER(HostStatusObserver, status_observers_,
                     OnClientRouteChange(session->client_jid(), channel_name,
                                         route));
 }
 
-void ChromotingHost::OnClientResolutionChanged(ClientSession* session,
-                                               const SkISize& size,
-                                               const SkIPoint& dpi) {
-  DCHECK(network_task_runner_->BelongsToCurrentThread());
-  FOR_EACH_OBSERVER(HostStatusObserver, status_observers_,
-                    OnClientResolutionChanged(session->client_jid(),
-                                              size, dpi));
-}
-
 void ChromotingHost::OnSessionManagerReady() {
   DCHECK(network_task_runner_->BelongsToCurrentThread());
   // Don't need to do anything here, just wait for incoming
   // connections.
 }
 
 void ChromotingHost::OnIncomingSession(
       protocol::Session* session,
       protocol::SessionManager::IncomingSessionResponse* response) {
   DCHECK(network_task_runner_->BelongsToCurrentThread());
@@ skipping 119 matching lines @@
   for (std::vector<base::Closure>::iterator it = shutdown_tasks_.begin();
        it != shutdown_tasks_.end(); ++it) {
     it->Run();
   }
   shutdown_tasks_.clear();
 
   weak_factory_.InvalidateWeakPtrs();
 }
 
 }  // namespace remoting