[DevTools] Migrate from AgentStateCallbacks to DevToolsAgentHostObserver.

chrome/browser/devtools/chrome_devtools_manager_delegate.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/chrome_devtools_manager_delegate.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "chrome/browser/devtools/device/android_device_manager.h"
@@ skipping 166 matching lines @@
 std::string ChromeDevToolsManagerDelegate::GetDiscoveryPageHTML() {
   return ResourceBundle::GetSharedInstance().GetRawDataResource(
       IDR_DEVTOOLS_DISCOVERY_PAGE_HTML).as_string();
 }
 
 std::string ChromeDevToolsManagerDelegate::GetFrontendResource(
     const std::string& path) {
   return content::DevToolsFrontendHost::GetFrontendResource(path).as_string();
 }
 
-void ChromeDevToolsManagerDelegate::DevToolsAgentStateChanged(
-    DevToolsAgentHost* agent_host,
-    bool attached) {
-  network_protocol_handler_->DevToolsAgentStateChanged(agent_host, attached);
+void ChromeDevToolsManagerDelegate::DevToolsAgentHostAttached(
+    content::DevToolsAgentHost* agent_host) {
+  network_protocol_handler_->DevToolsAgentStateChanged(agent_host, true);
+}
+
+void ChromeDevToolsManagerDelegate::DevToolsAgentHostDetached(
+    content::DevToolsAgentHost* agent_host) {
+  network_protocol_handler_->DevToolsAgentStateChanged(agent_host, false);
 }
 
 std::unique_ptr<base::DictionaryValue>
 ChromeDevToolsManagerDelegate::SetRemoteLocations(
     content::DevToolsAgentHost* agent_host,
     int command_id,
     base::DictionaryValue* params) {
   tcp_locations_.clear();
 
   base::ListValue* locations;
@@ skipping 16 matching lines @@
     if (!dictionary->GetIntegerWithoutPathExpansion(kPortParam, &port)) {
       return DevToolsProtocol::CreateInvalidParamsResponse(command_id,
                                                            kLocationsParam);
     }
     tcp_locations_.insert(net::HostPortPair(host, port));
   }
   std::unique_ptr<base::DictionaryValue> result(
       base::MakeUnique<base::DictionaryValue>());
   return DevToolsProtocol::CreateSuccessResponse(command_id, std::move(result));
 }