Always use chromium threads for IO in remoting host

remoting/host/host_mock_objects.h

 // 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.
 
 #ifndef REMOTING_HOST_HOST_MOCK_OBJECTS_H_
 #define REMOTING_HOST_HOST_MOCK_OBJECTS_H_
 
 #include "net/base/ip_endpoint.h"
 #include "remoting/host/video_frame_capturer.h"
 #include "remoting/host/chromoting_host_context.h"
@@ skipping 69 matching lines @@
   MOCK_METHOD0(Hide, void());
 };
 
 class MockChromotingHostContext : public ChromotingHostContext {
  public:
   MockChromotingHostContext();
   virtual ~MockChromotingHostContext();
 
   MOCK_METHOD0(Start, bool());
   MOCK_METHOD0(Stop, void());
-  MOCK_METHOD0(jingle_thread, JingleThread*());
   MOCK_METHOD0(ui_task_runner, base::SingleThreadTaskRunner*());
   MOCK_METHOD0(capture_task_runner, base::SingleThreadTaskRunner*());
   MOCK_METHOD0(encode_task_runner, base::SingleThreadTaskRunner*());
   MOCK_METHOD0(network_task_runner, base::SingleThreadTaskRunner*());
   MOCK_METHOD0(io_task_runner, base::SingleThreadTaskRunner*());
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockChromotingHostContext);
 };
 
@@ skipping 60 matching lines @@
   MOCK_METHOD2(Authenticate, bool(const std::string& username,
                                   const std::string& password));
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockUserAuthenticator);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_HOST_MOCK_OBJECTS_H_