Cleanup: merging three different constants.h into a single header.

remoting/base/constants.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/base/constants.h"
 
 namespace remoting {
 
 const char kChromotingBotJid[] = "remoting@bot.talk.google.com";
 
 const char kChromotingTokenDefaultServiceName[] = "chromiumsync";
 
 const char kChromotingXmlNamespace[] = "google:remoting";
 
 const char kAudioChannelName[] = "audio";
 const char kControlChannelName[] = "control";
 const char kEventChannelName[] = "event";
 const char kVideoChannelName[] = "video";
 const char kVideoRtpChannelName[] = "videortp";
 const char kVideoRtcpChannelName[] = "videortpc";
 
 const char kMimeTypeTextUtf8[] = "text/plain; charset=UTF-8";
 
+#if defined(OS_WIN)
+// The Omaha Appid of the host. It should be kept in sync with $(var.OmahaAppid)
+// defined in remoting/host/installer/chromoting.wxs and the Omaha server
+// configuration.
+const wchar_t kHostOmahaAppid[] = L"{b210701e-ffc4-49e3-932b-370728c72662}";
+#endif  // defined(OS_WIN)
+
 }  // namespace remoting