html_viewer: Move webcrypto to a place where html_viewer can use it.

components/webcrypto/algorithm_registry.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_ALGORITHM_REGISTRY_H_
-#define CONTENT_CHILD_WEBCRYPTO_ALGORITHM_REGISTRY_H_
+#ifndef COMPONENTS_WEBCRYPTO_ALGORITHM_REGISTRY_H_
+#define COMPONENTS_WEBCRYPTO_ALGORITHM_REGISTRY_H_
 
 #include "third_party/WebKit/public/platform/WebCrypto.h"
 
-namespace content {
-
 namespace webcrypto {
 
 class AlgorithmImplementation;
 class Status;
 
 // Retrieves the AlgorithmImplementation applicable for |id|.
 //
 // If there is no available implementation, then an error is returned, and
 // *impl is set to NULL.
 //
 // Otherwise Success is returned and *impl is set to a non-NULL value. The
 // AlgorithmImplementation pointer will remain valid until the program's
 // termination.
 Status GetAlgorithmImplementation(blink::WebCryptoAlgorithmId id,
                                   const AlgorithmImplementation** impl);
 
 }  // namespace webcrypto
 
-}  // namespace content
-
-#endif  // CONTENT_CHILD_WEBCRYPTO_ALGORITHM_REGISTRY_H_
+#endif  // COMPONENTS_WEBCRYPTO_ALGORITHM_REGISTRY_H_