WebCrypto: Add WebKit API structure for keys.

Source/modules/crypto/CryptoOperation.cpp

Index: Source/modules/crypto/CryptoOperation.cpp
diff --git a/Source/modules/crypto/CryptoOperation.cpp b/Source/modules/crypto/CryptoOperation.cpp
index a3a9fd7495cafe35784db42593cf357e61d833d9..dff9858af591a68d2da390252f04b337be0114f7 100644
--- a/Source/modules/crypto/CryptoOperation.cpp
+++ b/Source/modules/crypto/CryptoOperation.cpp
@@ -31,30 +31,10 @@
 #include "config.h"
 #include "modules/crypto/CryptoOperation.h"
 
-#include "modules/crypto/AesCbcParams.h"
-#include "modules/crypto/AesKeyGenParams.h"
 #include "modules/crypto/Algorithm.h"
 
 namespace WebCore {
 
-namespace {
-
-PassRefPtr<Algorithm> createAlgorithm(const WebKit::WebCryptoAlgorithm& algorithm)
-{
-    switch (algorithm.paramsType()) {
-    case WebKit::WebCryptoAlgorithmParamsTypeNone:
-        return Algorithm::create(algorithm);
-    case WebKit::WebCryptoAlgorithmParamsTypeAesCbcParams:
-        return AesCbcParams::create(algorithm);
-    case WebKit::WebCryptoAlgorithmParamsTypeAesKeyGenParams:
-        return AesKeyGenParams::create(algorithm);
-    }
-    ASSERT_NOT_REACHED();
-    return 0;
-}
-
-} // namespace
-
 CryptoOperation::CryptoOperation(const WebKit::WebCryptoAlgorithm& algorithm)
     : m_algorithm(algorithm)
 {
@@ -64,7 +44,7 @@ CryptoOperation::CryptoOperation(const WebKit::WebCryptoAlgorithm& algorithm)
 Algorithm* CryptoOperation::algorithm()
 {
     if (!m_algorithmNode)
-        m_algorithmNode = createAlgorithm(m_algorithm);
+        m_algorithmNode = Algorithm::create(m_algorithm);
     return m_algorithmNode.get();
 }