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

win8/viewer/metro_viewer_process_host.cc

 // 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.
 
 #include "win8/viewer/metro_viewer_process_host.h"
 
 #include <shlobj.h>
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/process.h"
 #include "base/strings/string16.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/time.h"
 #include "base/win/scoped_comptr.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_message_macros.h"
 #include "ui/aura/remote_root_window_host_win.h"
 #include "ui/metro_viewer/metro_viewer_messages.h"
+#include "win8/viewer/metro_viewer_constants.h"
 
 namespace win8 {
 
 MetroViewerProcessHost::InternalMessageFilter::InternalMessageFilter(
     MetroViewerProcessHost* owner) : owner_(owner) {
 }
 
 void MetroViewerProcessHost::InternalMessageFilter::OnChannelConnected(
     int32 /* peer_pid */) {
   owner_->NotifyChannelConnected();
 }
 
 MetroViewerProcessHost::MetroViewerProcessHost(
-    const std::string& ipc_channel_name,
     base::SingleThreadTaskRunner* ipc_task_runner) {
 
   channel_.reset(new IPC::ChannelProxy(
-      ipc_channel_name.c_str(),
+      kMetroViewerIPCChannelName,
       IPC::Channel::MODE_NAMED_SERVER,
       this,
       ipc_task_runner));
 }
 
 MetroViewerProcessHost::~MetroViewerProcessHost() {
 }
 
 base::ProcessId MetroViewerProcessHost::GetViewerProcessId() {
   if (channel_)
@@ skipping 51 matching lines @@
   return handled ? true :
       aura::RemoteRootWindowHostWin::Instance()->OnMessageReceived(message);
 }
 
 void MetroViewerProcessHost::NotifyChannelConnected() {
   if (channel_connected_event_)
     channel_connected_event_->Signal();
 }
 
 }  // namespace win8