DevTools: retain DTAH in all the targets to match their life time.

chromecast/browser/devtools/cast_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 "chromecast/browser/devtools/cast_devtools_manager_delegate.h"
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "chromecast/app/grit/shell_resources.h"
 #include "content/public/browser/devtools_agent_host.h"
@@ skipping 15 matching lines @@
 CastDevToolsManagerDelegate::CastDevToolsManagerDelegate() {
   DCHECK(!g_devtools_manager_delegate);
   g_devtools_manager_delegate = this;
 }
 
 CastDevToolsManagerDelegate::~CastDevToolsManagerDelegate() {
   DCHECK_EQ(this, g_devtools_manager_delegate);
   g_devtools_manager_delegate = nullptr;
 }
 
-bool CastDevToolsManagerDelegate::DiscoverTargets(
-    const content::DevToolsAgentHost::DiscoveryCallback& callback) {
+bool CastDevToolsManagerDelegate::CanDiscoverTargets() {
+  return true;
+}
+
+content::DevToolsAgentHost::List
+CastDevToolsManagerDelegate::DiscoverTargets() {
   content::DevToolsAgentHost::List enabled_hosts;
   for (auto* web_contents : enabled_webcontents_) {
     enabled_hosts.push_back(
         content::DevToolsAgentHost::GetOrCreateFor(web_contents));
   }
-  callback.Run(enabled_hosts);
-  return true;
+  return enabled_hosts;
 }
 
 void CastDevToolsManagerDelegate::EnableWebContentsForDebugging(
     content::WebContents* web_contents) {
   DCHECK(web_contents);
   enabled_webcontents_.insert(web_contents);
 }
 
 void CastDevToolsManagerDelegate::DisableWebContentsForDebugging(
     content::WebContents* web_contents) {
   enabled_webcontents_.erase(web_contents);
 }
 
 std::string CastDevToolsManagerDelegate::GetDiscoveryPageHTML() {
 #if defined(OS_ANDROID)
   return std::string();
 #else
   return ResourceBundle::GetSharedInstance().GetRawDataResource(
       IDR_CAST_SHELL_DEVTOOLS_DISCOVERY_PAGE).as_string();
 #endif
 }
 
 }  // namespace shell
 }  // namespace chromecast