Add testRunner.cancelAllActiveNotifications to close all active notifications.

Source/testing/runner/TestRunner.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2010 Pawel Hajdan (phajdan.jr@chromium.org)
  * Copyright (C) 2012 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
@@ skipping 455 matching lines @@
 
     // MIDI function to control permission handling.
     void setMIDIAccessorResult(const CppArgumentList&, CppVariant*);
     void setMIDISysExPermission(const CppArgumentList&, CppVariant*);
 
 #if ENABLE_NOTIFICATIONS
     // Grants permission for desktop notifications to an origin
     void grantWebNotificationPermission(const CppArgumentList&, CppVariant*);
     // Simulates a click on a desktop notification.
     void simulateLegacyWebNotificationClick(const CppArgumentList&, CppVariant*);
+    // Cancel all active desktop notifications.
+    void cancelAllActiveNotifications(const CppArgumentList& arguments, CppVariant* result);
 #endif
 
     // Speech input related functions.
     void addMockSpeechInputResult(const CppArgumentList&, CppVariant*);
     void setMockSpeechInputDumpRect(const CppArgumentList&, CppVariant*);
     void addMockSpeechRecognitionResult(const CppArgumentList&, CppVariant*);
     void setMockSpeechRecognitionError(const CppArgumentList&, CppVariant*);
     void wasMockSpeechRecognitionAborted(const CppArgumentList&, CppVariant*);
 
     // WebPageOverlay related functions. Permits the adding and removing of only
@@ skipping 229 matching lines @@
     enum {
         PointerLockWillSucceed,
         PointerLockWillRespondAsync,
         PointerLockWillFailSync,
     } m_pointerLockPlannedResult;
 };
 
 }
 
 #endif // TestRunner_h