[webcrypto] Check for empty key usages *after* key creation rather than before, to match the spec's…

components/webcrypto/algorithms/ec.h

Index: components/webcrypto/algorithms/ec.h
diff --git a/components/webcrypto/algorithms/ec.h b/components/webcrypto/algorithms/ec.h
index 1e9bd3e8b505dec5bde577905f1a7c13264eae1b..1484ad8114dbe1d212c607f171064ec1390b8c4a 100644
--- a/components/webcrypto/algorithms/ec.h
+++ b/components/webcrypto/algorithms/ec.h
@@ -32,45 +32,52 @@ class EcAlgorithm : public AlgorithmImplementation {
                      blink::WebCryptoKeyUsageMask usages,
                      GenerateKeyResult* result) const override;
 
-  Status VerifyKeyUsagesBeforeImportKey(
-      blink::WebCryptoKeyFormat format,
-      blink::WebCryptoKeyUsageMask usages) const override;
+  Status ImportKey(blink::WebCryptoKeyFormat format,
+                   const CryptoData& key_data,
+                   const blink::WebCryptoAlgorithm& algorithm,
+                   bool extractable,
+                   blink::WebCryptoKeyUsageMask usages,
+                   blink::WebCryptoKey* key) const override;
 
+  Status ExportKey(blink::WebCryptoKeyFormat format,
+                   const blink::WebCryptoKey& key,
+                   std::vector<uint8_t>* buffer) const override;
+
+  Status DeserializeKeyForClone(const blink::WebCryptoKeyAlgorithm& algorithm,
+                                blink::WebCryptoKeyType type,
+                                bool extractable,
+                                blink::WebCryptoKeyUsageMask usages,
+                                const CryptoData& key_data,
+                                blink::WebCryptoKey* key) const override;
+
+ private:
   Status ImportKeyPkcs8(const CryptoData& key_data,
                         const blink::WebCryptoAlgorithm& algorithm,
                         bool extractable,
                         blink::WebCryptoKeyUsageMask usages,
-                        blink::WebCryptoKey* key) const override;
+                        blink::WebCryptoKey* key) const;
 
   Status ImportKeySpki(const CryptoData& key_data,
                        const blink::WebCryptoAlgorithm& algorithm,
                        bool extractable,
                        blink::WebCryptoKeyUsageMask usages,
-                       blink::WebCryptoKey* key) const override;
+                       blink::WebCryptoKey* key) const;
 
   Status ImportKeyJwk(const CryptoData& key_data,
                       const blink::WebCryptoAlgorithm& algorithm,
                       bool extractable,
                       blink::WebCryptoKeyUsageMask usages,
-                      blink::WebCryptoKey* key) const override;
+                      blink::WebCryptoKey* key) const;
 
   Status ExportKeyPkcs8(const blink::WebCryptoKey& key,
-                        std::vector<uint8_t>* buffer) const override;
+                        std::vector<uint8_t>* buffer) const;
 
   Status ExportKeySpki(const blink::WebCryptoKey& key,
-                       std::vector<uint8_t>* buffer) const override;
+                       std::vector<uint8_t>* buffer) const;
 
   Status ExportKeyJwk(const blink::WebCryptoKey& key,
-                      std::vector<uint8_t>* buffer) const override;
+                      std::vector<uint8_t>* buffer) const;
 
-  Status DeserializeKeyForClone(const blink::WebCryptoKeyAlgorithm& algorithm,
-                                blink::WebCryptoKeyType type,
-                                bool extractable,
-                                blink::WebCryptoKeyUsageMask usages,
-                                const CryptoData& key_data,
-                                blink::WebCryptoKey* key) const override;
-
- private:
   const blink::WebCryptoKeyUsageMask all_public_key_usages_;
   const blink::WebCryptoKeyUsageMask all_private_key_usages_;
 };