autofill: Refactor PersonalDataManager::Observer into its own header file.

chrome/browser/ui/webui/options/autofill_options_handler.h

Index: chrome/browser/ui/webui/options/autofill_options_handler.h
diff --git a/chrome/browser/ui/webui/options/autofill_options_handler.h b/chrome/browser/ui/webui/options/autofill_options_handler.h
index 56991f2faa57d03714ce0b8576092454ec1061d3..1e8fe07a22606054ac966091b57b56955f5ffa27 100644
--- a/chrome/browser/ui/webui/options/autofill_options_handler.h
+++ b/chrome/browser/ui/webui/options/autofill_options_handler.h
@@ -8,16 +8,18 @@
 #include <string>
 
 #include "base/compiler_specific.h"
-#include "chrome/browser/autofill/personal_data_manager.h"
+#include "chrome/browser/autofill/personal_data_manager_observer.h"
 #include "chrome/browser/ui/webui/options/options_ui.h"
 
+class PersonalDataManager;
+
 namespace base {
 class DictionaryValue;
 class ListValue;
 }
 
 class AutofillOptionsHandler : public OptionsPageUIHandler,
-                               public PersonalDataManager::Observer {
+                               public PersonalDataManagerObserver {
  public:
   AutofillOptionsHandler();
   virtual ~AutofillOptionsHandler();
@@ -27,7 +29,7 @@ class AutofillOptionsHandler : public OptionsPageUIHandler,
   virtual void Initialize();
   virtual void RegisterMessages();
 
-  // PersonalDataManager::Observer implementation.
+  // PersonalDataManagerObserver implementation.
   virtual void OnPersonalDataChanged() OVERRIDE;
 
  private: