Revert of Rotate component updater CUP key to the 2017 key (ECDSA 7)

components/update_client/request_sender.cc

 // Copyright 2014 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 "components/update_client/request_sender.h"
 
 #include <algorithm>
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/client_update_protocol/ecdsa.h"
 #include "components/update_client/configurator.h"
 #include "components/update_client/utils.h"
 #include "net/http/http_response_headers.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_request_status.h"
 
 namespace update_client {
 
 namespace {
 
 // This is an ECDSA prime256v1 named-curve key.
-const int kKeyVersion = 7;
+const int kKeyVersion = 6;
 const char kKeyPubBytesBase64[] =
-    "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEj0QKufXIOBN30DtKeOYA5NV64FfY"
-    "HDou4sGqtcNUIlxpTzIbO45rB45QILhW6aDTwwjWLR1YCqpEAGICvFs8dQ==";
+    "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAECEDSRcZPKv8k4JEYbF7MJxxx56m+x8Z+svg5gB"
+    "mRX1J8A9DYRL6NvFkNcmcRtSNemUm7/iqrUnxaadkqcWSODw==";
 
 // The ETag header carries the ECSDA signature of the protocol response, if
 // signing has been used.
 const char kHeaderEtag[] = "ETag";
 
 // The server uses the optional X-Retry-After header to indicate that the
 // current request should not be attempted again. Any response received along
 // with the X-Retry-After header should be interpreted as it would have been
 // without the X-Retry-After header.
 //
@@ skipping 175 matching lines @@
 }
 
 int64_t RequestSender::GetInt64HeaderValue(const net::URLFetcher* source,
                                            const char* header_name) {
   auto* response_headers(source->GetResponseHeaders());
   return response_headers ? response_headers->GetInt64HeaderValue(header_name)
                           : -1;
 }
 
 }  // namespace update_client