[webcrypto] Remove support for null import algorithms.

content/child/webcrypto/webcrypto_impl.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_CHILD_WEBCRYPTO_WEBCRYPTO_IMPL_H_
 #define CONTENT_CHILD_WEBCRYPTO_WEBCRYPTO_IMPL_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "third_party/WebKit/public/platform/WebCrypto.h"
@@ skipping 25 matching lines @@
                       const unsigned char* data,
                       unsigned int data_size,
                       blink::WebCryptoResult result);
   virtual void generateKey(const blink::WebCryptoAlgorithm& algorithm,
                            bool extractable,
                            blink::WebCryptoKeyUsageMask usage_mask,
                            blink::WebCryptoResult result);
   virtual void importKey(blink::WebCryptoKeyFormat format,
                          const unsigned char* key_data,
                          unsigned int key_data_size,
-                         const blink::WebCryptoAlgorithm& algorithm_or_null,
+                         const blink::WebCryptoAlgorithm& algorithm,
                          bool extractable,
                          blink::WebCryptoKeyUsageMask usage_mask,
                          blink::WebCryptoResult result);
   virtual void exportKey(blink::WebCryptoKeyFormat format,
                          const blink::WebCryptoKey& key,
                          blink::WebCryptoResult result);
   virtual void sign(const blink::WebCryptoAlgorithm& algorithm,
                     const blink::WebCryptoKey& key,
                     const unsigned char* data,
                     unsigned int data_size,
@@ skipping 24 matching lines @@
   virtual bool serializeKeyForClone(const blink::WebCryptoKey& key,
                                     blink::WebVector<unsigned char>& key_data);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WebCryptoImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WEBCRYPTO_WEBCRYPTO_IMPL_H_