[webcrypto] Remove MockWebCrypto.

Source/testing/runner/WebTestInterfaces.cpp

Index: Source/testing/runner/WebTestInterfaces.cpp
diff --git a/Source/testing/runner/WebTestInterfaces.cpp b/Source/testing/runner/WebTestInterfaces.cpp
index 112e75b3fdd6402b3a3b0262b55f83ca5bc1c4c7..fc9c4d2afd111d27d172c32464298ccfe24bfe1c 100644
--- a/Source/testing/runner/WebTestInterfaces.cpp
+++ b/Source/testing/runner/WebTestInterfaces.cpp
@@ -31,7 +31,6 @@
 #include "public/testing/WebTestInterfaces.h"
 
 #include "MockWebAudioDevice.h"
-#include "MockWebCrypto.h"
 #include "MockWebMIDIAccessor.h"
 #include "MockWebMediaStreamCenter.h"
 #include "MockWebRTCPeerConnectionHandler.h"
@@ -116,9 +115,4 @@ WebAudioDevice* WebTestInterfaces::createAudioDevice(double sampleRate)
     return new MockWebAudioDevice(sampleRate);
 }
 
-WebCrypto* WebTestInterfaces::crypto()
-{
-    return MockWebCrypto::get();
-}
-
 }