Cleanup: Remove more unneeded browser_thread.h includes.

chrome/browser/chromeos/process_proxy/process_proxy_registry.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 "chrome/browser/chromeos/process_proxy/process_proxy_registry.h"
 
 #include "base/bind.h"
-#include "content/public/browser/browser_thread.h"
 
 namespace {
 
 const char kWatcherThreadName[] = "ProcessWatcherThread";
 
 const char kStdoutOutputType[] = "stdout";
 const char kStderrOutputType[] = "stderr";
 const char kExitOutputType[] = "exit";
 
 const char* ProcessOutputTypeToString(ProcessOutputType type) {
@@ skipping 113 matching lines @@
   if (it == proxy_map_.end())
     return;
   it->second.callback.Run(pid, std::string(type_str), data);
 
   // Contact with the slave end of the terminal has been lost. We have to close
   // the process.
   if (type == PROCESS_OUTPUT_TYPE_EXIT)
     CloseProcess(pid);
 }