[webcrypto] Remove MockWebCrypto.

Source/testing/runner/runner.gypi

 # Copyright (C) 2013 Google 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
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 35 matching lines @@
       'MockColorChooser.cpp',
       'MockColorChooser.h',
       'MockConstraints.cpp',
       'MockConstraints.h',
       'MockGrammarCheck.cpp',
       'MockGrammarCheck.h',
       'MockSpellCheck.cpp',
       'MockSpellCheck.h',
       'MockWebAudioDevice.cpp',
       'MockWebAudioDevice.h',
-      'MockWebCrypto.cpp',
-      'MockWebCrypto.h',
       'MockWebMediaStreamCenter.cpp',
       'MockWebMediaStreamCenter.h',
       'MockWebMIDIAccessor.cpp',
       'MockWebMIDIAccessor.h',
       'MockWebRTCDataChannelHandler.cpp',
       'MockWebRTCDataChannelHandler.h',
       'MockWebRTCDTMFSenderHandler.cpp',
       'MockWebRTCDTMFSenderHandler.h',
       'MockWebRTCPeerConnectionHandler.cpp',
       'MockWebRTCPeerConnectionHandler.h',
@@ skipping 27 matching lines @@
       'WebTestThemeControlWin.h',
       'WebTestThemeEngineMac.mm',
       'WebTestThemeEngineMac.h',
       'WebTestThemeEngineWin.cpp',
       'WebTestThemeEngineWin.h',
       'WebUserMediaClientMock.cpp',
       'WebUserMediaClientMock.h',
     ],
   }
 }