Move PrefMember and PrefChangeRegistrar to api directory.

chrome/browser/api/prefs/pref_member.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.
 //
 // A helper class that stays in sync with a preference (bool, int, real,
 // string or filepath).  For example:
 //
 // class MyClass {
 //  public:
 //   MyClass(PrefService* prefs) {
 //     my_string_.Init(prefs::kHomePage, prefs, NULL /* no observer */);
 //   }
 //  private:
 //   StringPrefMember my_string_;
 // };
 //
 // my_string_ should stay in sync with the prefs::kHomePage pref and will
 // update if either the pref changes or if my_string_.SetValue is called.
 //
 // An optional observer can be passed into the Init method which can be used to
 // notify MyClass of changes. Note that if you use SetValue(), the observer
 // will not be notified.
 
-#ifndef CHROME_BROWSER_PREFS_PREF_MEMBER_H_
-#define CHROME_BROWSER_PREFS_PREF_MEMBER_H_
+#ifndef CHROME_BROWSER_API_PREFS_PREF_MEMBER_H_
+#define CHROME_BROWSER_API_PREFS_PREF_MEMBER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/values.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_observer.h"
@@ skipping 202 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(PrefMember);
 };
 
 typedef PrefMember<bool> BooleanPrefMember;
 typedef PrefMember<int> IntegerPrefMember;
 typedef PrefMember<double> DoublePrefMember;
 typedef PrefMember<std::string> StringPrefMember;
 typedef PrefMember<FilePath> FilePathPrefMember;
 
-#endif  // CHROME_BROWSER_PREFS_PREF_MEMBER_H_
+#endif  // CHROME_BROWSER_API_PREFS_PREF_MEMBER_H_