arc-bridge: Introduce the ArcService class

components/arc/ime/arc_ime_ipc_host.h

 // 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.
 
 #ifndef COMPONENTS_ARC_IME_ARC_IME_IPC_HOST_H_
 #define COMPONENTS_ARC_IME_ARC_IME_IPC_HOST_H_
 
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "components/arc/arc_bridge_service.h"
@@ skipping 33 matching lines @@
   // Serializes and sends IME related requests through IPCs.
   void SendSetCompositionText(const ui::CompositionText& composition);
   void SendConfirmCompositionText();
   void SendInsertText(const base::string16& text);
 
   // arc::ImeHost:
   void OnTextInputTypeChanged(arc::TextInputType type) override;
   void OnCursorRectChanged(arc::CursorRectPtr rect) override;
 
  private:
+  ArcBridgeService* const arc_bridge_service_;  // owned by ArcServiceManager.
+
   mojo::Binding<ImeHost> binding_;
   Delegate* const delegate_;
-  ArcBridgeService* const bridge_service_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcImeIpcHost);
 };
 
 }  // namespace arc
 
 #endif  // COMPONENTS_ARC_IME_ARC_IME_IPC_HOST_H_