Make the browser->metro_viewer IPC channel name a constant instead of hardcoding it in a few places…

win8/viewer/metro_viewer_process_host.h

 // Copyright (c) 2013 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 WIN8_VIEWER_METRO_VIEWER_PROCESS_HOST_H_
 #define WIN8_VIEWER_METRO_VIEWER_PROCESS_HOST_H_
 
-#include <string>
-
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "base/threading/non_thread_safe.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sender.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 class WaitableEvent;
 }
 
 namespace IPC {
 class Message;
 }
 
 namespace win8 {
 
 // Abstract base class for various Metro viewer process host implementations.
 class MetroViewerProcessHost : public IPC::Listener,
                                public IPC::Sender,
                                public base::NonThreadSafe {
  public:
-  // Initializes a viewer process host over |ipc_channel_name|. The given task
-  // runner correspond to a thread on which IPC::Channel is created and used
-  // (e.g. IO thread). Instantly connects to the viewer process if one is
-  // already connected to |ipc_channel_name|; a viewer can otherwise be
-  // launched synchronously via LaunchViewerAndWaitForConnection().
-  MetroViewerProcessHost(const std::string& ipc_channel_name,
-                         base::SingleThreadTaskRunner* ipc_task_runner);
+  // Initializes a viewer process host to connect to the Metro viewer process
+  // over IPC. The given task runner correspond to a thread on which
+  // IPC::Channel is created and used (e.g. IO thread). Instantly connects to
+  // the viewer process if one is already connected to |ipc_channel_name|; a
+  // viewer can otherwise be launched synchronously via
+  // LaunchViewerAndWaitForConnection().
+  explicit MetroViewerProcessHost(
+      base::SingleThreadTaskRunner* ipc_task_runner);
   virtual ~MetroViewerProcessHost();
 
   // Returns the process id of the viewer process if one is connected to this
   // host, returns base::kNullProcessId otherwise.
   base::ProcessId GetViewerProcessId();
 
   // Launches the viewer process associated with the given |app_user_model_id|
   // and blocks until that viewer process connects or until a timeout is
   // reached. Returns true if the viewer process connects before the timeout is
   // reached. NOTE: this assumes that the app referred to by |app_user_model_id|
@@ skipping 42 matching lines @@
 
   scoped_ptr<IPC::ChannelProxy> channel_;
   scoped_ptr<base::WaitableEvent> channel_connected_event_;
 
   DISALLOW_COPY_AND_ASSIGN(MetroViewerProcessHost);
 };
 
 }  // namespace win8
 
 #endif  // WIN8_VIEWER_METRO_VIEWER_PROCESS_HOST_H_