Expose crypto.getRandomValues() to workers.

Source/modules/crypto/RandomSource.cpp

Index: Source/modules/crypto/RandomSource.cpp
diff --git a/Source/modules/crypto/Crypto.cpp b/Source/modules/crypto/RandomSource.cpp
similarity index 88%
copy from Source/modules/crypto/Crypto.cpp
copy to Source/modules/crypto/RandomSource.cpp
index a2e55daaa82295fd417022c3b1cbe7a6cb09e019..cdab398134a57ede5cd3b7ca1969088d788862ca 100644
--- a/Source/modules/crypto/Crypto.cpp
+++ b/Source/modules/crypto/RandomSource.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 Google Inc. All rights reserved.
+ * 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
@@ -28,7 +28,7 @@
 
 
 #include "config.h"
-#include "modules/crypto/Crypto.h"
+#include "modules/crypto/RandomSource.h"
 
 #include "core/dom/ExceptionCode.h"
 #include "wtf/ArrayBufferView.h"
@@ -52,12 +52,13 @@ bool isIntegerArray(ArrayBufferView* array)
 
 }
 
-Crypto::Crypto()
+RandomSource::RandomSource()
 {
     ScriptWrappable::init(this);
 }
 
-void Crypto::getRandomValues(ArrayBufferView* array, ExceptionCode& ec)
+// Note: This implementation MUST be thread-safe, as it is used by workers.
+void RandomSource::getRandomValues(ArrayBufferView* array, ExceptionCode& ec)
 {
     if (!array || !isIntegerArray(array)) {
         ec = TYPE_MISMATCH_ERR;
@@ -70,11 +71,4 @@ void Crypto::getRandomValues(ArrayBufferView* array, ExceptionCode& ec)
     cryptographicallyRandomValues(array->baseAddress(), array->byteLength());
 }
 
-SubtleCrypto* Crypto::subtle()
-{
-    if (!m_subtleCrypto)
-        m_subtleCrypto = SubtleCrypto::create();
-    return m_subtleCrypto.get();
-}
-
 }