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

chrome/test/live_sync/autofill_helper.cc

Index: chrome/test/live_sync/autofill_helper.cc
diff --git a/chrome/test/live_sync/autofill_helper.cc b/chrome/test/live_sync/autofill_helper.cc
index b81d8e26715c56b122b279db318732b009fb7f16..942d590c76d0dd875222118c433409523d9790ba 100644
--- a/chrome/test/live_sync/autofill_helper.cc
+++ b/chrome/test/live_sync/autofill_helper.cc
@@ -7,6 +7,8 @@
 #include "chrome/browser/autofill/autofill_common_test.h"
 #include "chrome/browser/autofill/autofill_profile.h"
 #include "chrome/browser/autofill/autofill_type.h"
+#include "chrome/browser/autofill/personal_data_manager.h"
+#include "chrome/browser/autofill/personal_data_manager_observer.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sync/profile_sync_service.h"
 #include "chrome/browser/sync/profile_sync_test_util.h"
@@ -73,7 +75,7 @@ class AutofillDBThreadObserverHelper : public DBThreadObserverHelper {
   }
 };
 
-class MockPersonalDataManagerObserver : public PersonalDataManager::Observer {
+class MockPersonalDataManagerObserver : public PersonalDataManagerObserver {
  public:
   MOCK_METHOD0(OnPersonalDataChanged, void());
 };