[DevTools] Support multiple sessions in content/ domain handlers

content/browser/devtools/protocol/network_handler.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 "content/browser/devtools/protocol/network_handler.h"
 
 #include <stddef.h>
 
 #include "base/barrier_closure.h"
 #include "base/command_line.h"
@@ skipping 408 matching lines @@
 NetworkHandler::NetworkHandler()
     : DevToolsDomainHandler(Network::Metainfo::domainName),
       host_(nullptr),
       enabled_(false) {
 }
 
 NetworkHandler::~NetworkHandler() {
 }
 
 // static
-NetworkHandler* NetworkHandler::FromSession(DevToolsSession* session) {
-  return static_cast<NetworkHandler*>(
-      session->GetHandlerByName(Network::Metainfo::domainName));
+std::vector<NetworkHandler*> NetworkHandler::ForAgentHost(
+    DevToolsAgentHostImpl* host) {
+  return DevToolsSession::HandlersForAgentHost<NetworkHandler>(
+      host, Network::Metainfo::domainName);
 }
 
 void NetworkHandler::Wire(UberDispatcher* dispatcher) {
   frontend_.reset(new Network::Frontend(dispatcher->channel()));
   Network::Dispatcher::wire(dispatcher, this);
 }
 
 void NetworkHandler::SetRenderFrameHost(RenderFrameHostImpl* host) {
   host_ = host;
 }
@@ skipping 314 matching lines @@
           static_cast<double>(base::Time::kMicrosecondsPerSecond),
       Page::ResourceTypeEnum::Document, error_string, cancelled);
 }
 
 std::string NetworkHandler::UserAgentOverride() const {
   return enabled_ ? user_agent_ : std::string();
 }
 
 }  // namespace protocol
 }  // namespace content