Create AutofillDriverImpl unit test.

components/autofill/browser/autofill_manager.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.
 
 #ifndef COMPONENTS_AUTOFILL_BROWSER_AUTOFILL_MANAGER_H_
 #define COMPONENTS_AUTOFILL_BROWSER_AUTOFILL_MANAGER_H_
 
 #include <list>
 #include <map>
 #include <string>
@@ skipping 73 matching lines @@
   // Registers our Enable/Disable Autofill pref.
   static void RegisterUserPrefs(user_prefs::PrefRegistrySyncable* registry);
 
   AutofillManager(AutofillDriver* driver,
                   autofill::AutofillManagerDelegate* delegate,
                   const std::string& app_locale,
                   AutofillDownloadManagerState enable_download_manager);
   virtual ~AutofillManager();
 
   // Set an external delegate.
-  void SetExternalDelegate(AutofillExternalDelegate* delegate);
+  virtual void SetExternalDelegate(AutofillExternalDelegate* delegate);
 
   // Whether browser process will create and own the Autofill popup UI.
   bool IsNativeUiEnabled();
 
   // Called from our external delegate so they cannot be private.
   virtual void OnFillAutofillFormData(int query_id,
                                       const FormData& form,
                                       const FormFieldData& field,
                                       int unique_id);
   void OnDidShowAutofillSuggestions(bool is_new_popup);
@@ skipping 316 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(AutofillMetricsTest,
                            UserHappinessFormLoadAndSubmission);
   FRIEND_TEST_ALL_PREFIXES(AutofillMetricsTest, UserHappinessFormInteraction);
 
   DISALLOW_COPY_AND_ASSIGN(AutofillManager);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_BROWSER_AUTOFILL_MANAGER_H_