[ServiceWorker] Don't send the UMA related headers to the ServiceWorker.

chrome/browser/devtools/devtools_network_transaction_factory.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 "chrome/browser/devtools/devtools_network_transaction_factory.h"
 
+#include <set>
+#include <string>
+
 #include "chrome/browser/devtools/devtools_network_controller.h"
 #include "chrome/browser/devtools/devtools_network_transaction.h"
+#include "content/public/browser/service_worker_context.h"
 #include "net/base/net_errors.h"
 #include "net/http/http_network_layer.h"
 #include "net/http/http_network_transaction.h"
 
 DevToolsNetworkTransactionFactory::DevToolsNetworkTransactionFactory(
     DevToolsNetworkController* controller,
     net::HttpNetworkSession* session)
     : controller_(controller),
       network_layer_(new net::HttpNetworkLayer(session)) {
+  std::set<std::string> headers;
+  headers.insert(DevToolsNetworkTransaction::kDevToolsRequestInitiator);
+  headers.insert(
+      DevToolsNetworkTransaction::kDevToolsEmulateNetworkConditionsClientId);
+  content::ServiceWorkerContext::AddExcludedHeadersForFetchEvent(headers);
 }
 
 DevToolsNetworkTransactionFactory::~DevToolsNetworkTransactionFactory() {
 }
 
 int DevToolsNetworkTransactionFactory::CreateTransaction(
     net::RequestPriority priority,
     scoped_ptr<net::HttpTransaction>* trans) {
   scoped_ptr<net::HttpTransaction> network_transaction;
   int rv = network_layer_->CreateTransaction(priority, &network_transaction);
   if (rv != net::OK) {
     return rv;
   }
   trans->reset(
       new DevToolsNetworkTransaction(controller_, network_transaction.Pass()));
   return net::OK;
 }
 
 net::HttpCache* DevToolsNetworkTransactionFactory::GetCache() {
   return network_layer_->GetCache();
 }
 
 net::HttpNetworkSession* DevToolsNetworkTransactionFactory::GetSession() {
   return network_layer_->GetSession();
 }