[webcrypto] Make operations run on worker threads.

content/child/webcrypto/webcrypto_impl.h

Index: content/child/webcrypto/webcrypto_impl.h
diff --git a/content/child/webcrypto/webcrypto_impl.h b/content/child/webcrypto/webcrypto_impl.h
index f28cdb1a479336573f36910c92eabad64a6f3e76..179de041cb5c7a1f0963ec0fb9b34a9d385674c4 100644
--- a/content/child/webcrypto/webcrypto_impl.h
+++ b/content/child/webcrypto/webcrypto_impl.h
@@ -13,7 +13,7 @@
 
 namespace content {
 
-// Wrapper around the blink WebCrypto asynchronous interface, which forwards to
+// Wrapper around the Blink WebCrypto asynchronous interface, which forwards to
 // the synchronous platfrom (NSS or OpenSSL) implementation.
 //
 // TODO(eroman): Post the synchronous work to a background thread.
@@ -77,12 +77,7 @@ class WebCryptoImpl : public blink::WebCrypto {
       bool extractable,
       blink::WebCryptoKeyUsageMask usages,
       blink::WebCryptoResult result);
-  // This method synchronously computes a digest for the given data, returning
-  // |true| if successful and |false| otherwise.
-  virtual bool digestSynchronous(const blink::WebCryptoAlgorithmId algorithm_id,
-                                 const unsigned char* data,
-                                 unsigned int data_size,
-                                 blink::WebArrayBuffer& result);
+
   // This method returns a digestor object that can be used to synchronously
   // compute a digest one chunk at a time. Thus, the consume does not need to
   // hold onto a large buffer with all the data to digest. Chunks can be given