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

chrome/browser/devtools/device/devtools_device_discovery.h

 // 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.
 
 #ifndef CHROME_BROWSER_DEVTOOLS_DEVICE_DEVTOOLS_DEVICE_DISCOVERY_H_
 #define CHROME_BROWSER_DEVTOOLS_DEVICE_DEVTOOLS_DEVICE_DISCOVERY_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 21 matching lines @@
     RemotePage(scoped_refptr<AndroidDeviceManager::Device> device,
                const std::string& browser_id,
                const base::DictionaryValue& dict);
 
     virtual ~RemotePage();
 
     scoped_refptr<AndroidDeviceManager::Device> device_;
     std::string browser_id_;
     std::string frontend_url_;
     std::unique_ptr<base::DictionaryValue> dict_;
+    scoped_refptr<content::DevToolsAgentHost> agent_host_;
 
     DISALLOW_COPY_AND_ASSIGN(RemotePage);
   };
 
   using RemotePages = std::vector<scoped_refptr<RemotePage>>;
 
   class RemoteBrowser : public base::RefCountedThreadSafe<RemoteBrowser> {
    public:
     const std::string& serial() { return serial_; }
     const std::string& socket() { return browser_id_; }
@@ skipping 83 matching lines @@
 
   AndroidDeviceManager* device_manager_;
   const DeviceListCallback callback_;
   base::Callback<void(const base::Closure&)> task_scheduler_;
   base::WeakPtrFactory<DevToolsDeviceDiscovery> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsDeviceDiscovery);
 };
 
 #endif  // CHROME_BROWSER_DEVTOOLS_DEVICE_DEVTOOLS_DEVICE_DISCOVERY_H_