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

components/webcrypto/algorithms/aes.h

Index: components/webcrypto/algorithms/aes.h
diff --git a/components/webcrypto/algorithms/aes.h b/components/webcrypto/algorithms/aes.h
index 65b82d74590f9931e18b6dfc1c7a60f7fda0072d..b7b0ad55961951198f45195dbad851f3c983fd58 100644
--- a/components/webcrypto/algorithms/aes.h
+++ b/components/webcrypto/algorithms/aes.h
@@ -33,40 +33,47 @@ class AesAlgorithm : 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;
+
+  Status GetKeyLength(const blink::WebCryptoAlgorithm& key_length_algorithm,
+                      bool* has_length_bits,
+                      unsigned int* length_bits) const override;
+
+ private:
   Status ImportKeyRaw(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 ExportKeyRaw(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;
-
-  Status GetKeyLength(const blink::WebCryptoAlgorithm& key_length_algorithm,
-                      bool* has_length_bits,
-                      unsigned int* length_bits) const override;
-
- private:
   const blink::WebCryptoKeyUsageMask all_key_usages_;
   const std::string jwk_suffix_;
 };