[webcrypto] Make operations run on worker threads.

content/child/webcrypto/webcrypto_util.h

Index: content/child/webcrypto/webcrypto_util.h
diff --git a/content/child/webcrypto/webcrypto_util.h b/content/child/webcrypto/webcrypto_util.h
index 60f0dbdfa7ed001907f2ca61bc0fea02a782e4d7..81d2c61cc14d050ffb7eeafab23db33d04e07ea8 100644
--- a/content/child/webcrypto/webcrypto_util.h
+++ b/content/child/webcrypto/webcrypto_util.h
@@ -11,7 +11,6 @@
 #include "base/strings/string_piece.h"
 #include "base/values.h"
 #include "content/common/content_export.h"
-#include "third_party/WebKit/public/platform/WebArrayBuffer.h"
 #include "third_party/WebKit/public/platform/WebCryptoAlgorithm.h"
 #include "third_party/WebKit/public/platform/WebCryptoKey.h"
 
@@ -25,15 +24,7 @@ class Status;
 // convenience function for getting the pointer, and should not be used beyond
 // the expected lifetime of |data|.
 CONTENT_EXPORT const uint8* Uint8VectorStart(const std::vector<uint8>& data);
-
-// Shrinks a WebArrayBuffer to a new size.
-// TODO(eroman): This works by re-allocating a new buffer. It would be better if
-//               the WebArrayBuffer could just be truncated instead.
-void ShrinkBuffer(blink::WebArrayBuffer* buffer, unsigned int new_size);
-
-// Creates a WebArrayBuffer from a uint8 byte array
-blink::WebArrayBuffer CreateArrayBuffer(const uint8* data,
-                                        unsigned int data_size);
+CONTENT_EXPORT uint8* Uint8VectorStart(std::vector<uint8>* data);
 
 // This function decodes unpadded 'base64url' encoded data, as described in
 // RFC4648 (http://www.ietf.org/rfc/rfc4648.txt) Section 5.