Update a bunch of files to the new location of browser_thread.h

chrome/browser/chromeos/plugin_selection_policy.cc

 // Copyright (c) 2010 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/plugin_selection_policy.h"
 
 #include <algorithm>
 #include <iostream>
 #include <map>
 #include <sstream>
 #include <string>
 #include <vector>
 
 #include "base/auto_reset.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/string_util.h"
-#include "chrome/browser/browser_thread.h"
+#include "content/browser/browser_thread.h"
 #include "googleurl/src/gurl.h"
 
 #if !defined(OS_CHROMEOS)
 #error This file is meant to be compiled on ChromeOS only.
 #endif
 
 using std::vector;
 using std::string;
 using std::pair;
 using std::map;
@@ skipping 131 matching lines @@
     }
     return allow;
   }
 
   // If it's not in the policy file, then we assume it's OK to allow
   // it.
   return true;
 }
 
 }  // namespace chromeos