Refactor the interface for generating keys.

content/child/webcrypto/openssl/rsa_key_openssl.h

Index: content/child/webcrypto/openssl/rsa_key_openssl.h
diff --git a/content/child/webcrypto/openssl/rsa_key_openssl.h b/content/child/webcrypto/openssl/rsa_key_openssl.h
index 86a69316df475c93216a92d524c71748eb6083ab..a8ea173bd51ab28cb74daa6dc64d3f86e5ab2157 100644
--- a/content/child/webcrypto/openssl/rsa_key_openssl.h
+++ b/content/child/webcrypto/openssl/rsa_key_openssl.h
@@ -38,18 +38,10 @@ class RsaHashedAlgorithm : public AlgorithmImplementation {
   virtual const char* GetJwkAlgorithm(
       const blink::WebCryptoAlgorithmId hash) const = 0;
 
-  virtual Status VerifyKeyUsagesBeforeGenerateKeyPair(
-      blink::WebCryptoKeyUsageMask combined_usage_mask,
-      blink::WebCryptoKeyUsageMask* public_usage_mask,
-      blink::WebCryptoKeyUsageMask* private_usage_mask) const OVERRIDE;
-
-  virtual Status GenerateKeyPair(
-      const blink::WebCryptoAlgorithm& algorithm,
-      bool extractable,
-      blink::WebCryptoKeyUsageMask public_usage_mask,
-      blink::WebCryptoKeyUsageMask private_usage_mask,
-      blink::WebCryptoKey* public_key,
-      blink::WebCryptoKey* private_key) const OVERRIDE;
+  virtual Status GenerateKey(const blink::WebCryptoAlgorithm& algorithm,
+                             bool extractable,
+                             blink::WebCryptoKeyUsageMask usage_mask,
+                             GenerateKeyResult* result) const OVERRIDE;
 
   virtual Status VerifyKeyUsagesBeforeImportKey(
       blink::WebCryptoKeyFormat format,