Make ServiceWorkerFetchRequest and ServiceWorkerResponse header maps case insensitive

content/renderer/service_worker/embedded_worker_context_client.cc

 // Copyright 2013 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 "content/renderer/service_worker/embedded_worker_context_client.h"
 
 #include <map>
 #include <string>
 
 #include "base/debug/trace_event.h"
@@ skipping 261 matching lines @@
   script_context_->DidHandleFetchEvent(
       request_id,
       SERVICE_WORKER_FETCH_EVENT_RESULT_FALLBACK,
       ServiceWorkerResponse());
 }
 
 void EmbeddedWorkerContextClient::didHandleFetchEvent(
     int request_id,
     const blink::WebServiceWorkerResponse& web_response) {
   DCHECK(script_context_);
-  std::map<std::string, std::string> headers;
+  ServiceWorkerHeaderMap headers;
   const blink::WebVector<blink::WebString>& header_keys =
       web_response.getHeaderKeys();
   for (size_t i = 0; i < header_keys.size(); ++i) {
     const base::string16& key = header_keys[i];
     headers[base::UTF16ToUTF8(key)] =
         base::UTF16ToUTF8(web_response.getHeader(key));
   }
   ServiceWorkerResponse response(web_response.url(),
                                  web_response.status(),
                                  web_response.statusText().utf8(),
@@ skipping 51 matching lines @@
 
 void EmbeddedWorkerContextClient::SendWorkerStarted() {
   DCHECK(worker_task_runner_->RunsTasksOnCurrentThread());
   TRACE_EVENT_ASYNC_END0("ServiceWorker",
                          "EmbeddedWorkerContextClient::StartingWorkerContext",
                          this);
   Send(new EmbeddedWorkerHostMsg_WorkerStarted(embedded_worker_id_));
 }
 
 }  // namespace content