WebCrypto: Add WebKit API structure for keys.

Source/modules/crypto/Algorithm.h

Index: Source/modules/crypto/Algorithm.h
diff --git a/Source/modules/crypto/Algorithm.h b/Source/modules/crypto/Algorithm.h
index 17bfc7f366479ce2eac3dd57abc1fd24b4ee4066..082d4f64b8ebeb5552c297431db481e6989663ba 100644
--- a/Source/modules/crypto/Algorithm.h
+++ b/Source/modules/crypto/Algorithm.h
@@ -39,13 +39,11 @@
 
 namespace WebCore {
 
-typedef int ExceptionCode;
-
 class Algorithm : public ScriptWrappable, public RefCounted<Algorithm> {
 public:
     static PassRefPtr<Algorithm> create(const WebKit::WebCryptoAlgorithm& algorithm) { return adoptRef(new Algorithm(algorithm)); }
 
-    const String& name();
+    String name();
 
     WebKit::WebCryptoAlgorithmParamsType type() const { return m_algorithm.paramsType(); }
 
@@ -53,7 +51,6 @@ protected:
     explicit Algorithm(const WebKit::WebCryptoAlgorithm&);
 
     const WebKit::WebCryptoAlgorithm m_algorithm;
-    String m_name;
 };
 
 } // namespace WebCore