Fix a header guard to match filepath.

content/child/webcrypto/algorithm_implementation.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_CRYPTO_ALGORITHM_IMPLEMENTATION_H_
-#define CONTENT_CHILD_WEBCRYPTO_CRYPTO_ALGORITHM_IMPLEMENTATION_H_
+#ifndef CONTENT_CHILD_WEBCRYPTO_ALGORITHM_IMPLEMENTATION_H_
+#define CONTENT_CHILD_WEBCRYPTO_ALGORITHM_IMPLEMENTATION_H_
 
 #include <stdint.h>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "third_party/WebKit/public/platform/WebCrypto.h"
 
 namespace content {
 
 namespace webcrypto {
@@ skipping 147 matching lines @@
                                std::vector<uint8_t>* buffer) const;
 
   virtual Status ExportKeyJwk(const blink::WebCryptoKey& key,
                               std::vector<uint8_t>* buffer) const;
 };
 
 }  // namespace webcrypto
 
 }  // namespace content
 
-#endif  // CONTENT_CHILD_WEBCRYPTO_CRYPTO_ALGORITHM_IMPLEMENTATION_H_
+#endif  // CONTENT_CHILD_WEBCRYPTO_ALGORITHM_IMPLEMENTATION_H_