Move remoting::GetUsername() from remoting/base to remoting/host

remoting/base/util.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_BASE_UTIL_H_
 #define REMOTING_BASE_UTIL_H_
 
 #include <string>
 
 #include "media/base/video_frame.h"
@@ skipping 75 matching lines @@
 
 // Replaces every occurrence of "\n" in a string by "\r\n".
 std::string ReplaceLfByCrLf(const std::string& in);
 
 // Replaces every occurrence of "\r\n" in a string by "\n".
 std::string ReplaceCrLfByLf(const std::string& in);
 
 // Checks if the given string is a valid UTF-8 string.
 bool StringIsUtf8(const char* data, size_t length);
 
-// Returns the username associated with this process, or the empty string on
-// error or if not implemented.
-std::string GetUsername();
-
 bool DoesRectContain(const webrtc::DesktopRect& a,
                      const webrtc::DesktopRect& b);
 
 }  // namespace remoting
 
 #endif  // REMOTING_BASE_UTIL_H_