[webcrypto] Add support for import/export of "raw" formatted EC keys.

components/webcrypto/ec_import_key_raw_fuzzer.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "components/webcrypto/fuzzer_support.h"
 
 // Entry point for LibFuzzer.
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
-  webcrypto::ImportEcKeyFromDerFuzzData(data, size,
-                                        blink::WebCryptoKeyFormatSpki);
+  webcrypto::ImportEcKeyFromRawFuzzData(data, size);
+
   return 0;
 }