Delete obviously unneeded forward declarations in chrome/browser/*.h.

chrome/test/testing_browser_process.h

 // 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.
 
 // An implementation of BrowserProcess for unit tests that fails for most
 // services. By preventing creation of services, we reduce dependencies and
 // keep the profile clean. Clients of this class must handle the NULL return
 // value, however.
 
 #ifndef CHROME_TEST_TESTING_BROWSER_PROCESS_H_
@@ skipping 57 matching lines @@
   }
 
   virtual ProfileManager* profile_manager() {
     return NULL;
   }
 
   virtual PrefService* local_state() {
     return NULL;
   }
 
-  virtual WebAppInstallerService* web_app_installer_service() {
-    return NULL;
-  }
-
   virtual IconManager* icon_manager() {
     return NULL;
   }
 
   virtual ThumbnailGenerator* GetThumbnailGenerator() {
     return NULL;
   }
 
   virtual DevToolsManager* devtools_manager() {
     return NULL;
@@ skipping 77 matching lines @@
   NotificationService notification_service_;
   scoped_ptr<base::WaitableEvent> shutdown_event_;
   unsigned int module_ref_count_;
   scoped_ptr<Clipboard> clipboard_;
   std::string app_locale_;
 
   DISALLOW_COPY_AND_ASSIGN(TestingBrowserProcess);
 };
 
 #endif  // CHROME_TEST_TESTING_BROWSER_PROCESS_H_