Use WeakPtr in HotwordService Constructor to ensure that invokes to InitializeMicrophoneObserver ca…

chrome/browser/search/hotword_service.cc

 // Copyright 2013 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/search/hotword_service.h"
 
 #include <stddef.h>
 
 #include <string>
 
@@ skipping 384 matching lines @@
     user_manager::UserManager::Get()->AddSessionStateObserver(
         session_observer_.get());
   }
 #endif
 
   // Register with the device observer list to update the microphone
   // availability.
   content::BrowserThread::PostTask(
       content::BrowserThread::UI, FROM_HERE,
       base::Bind(&HotwordService::InitializeMicrophoneObserver,
-                 base::Unretained(this)));
+                 weak_factory_.GetWeakPtr()));
 }
 
 HotwordService::~HotwordService() {
 #if defined(OS_CHROMEOS)
   if (user_manager::UserManager::IsInitialized() && session_observer_) {
     user_manager::UserManager::Get()->RemoveSessionStateObserver(
         session_observer_.get());
   }
 #endif
 }
@@ skipping 459 matching lines @@
   // Only support multiple profiles and profile switching in ChromeOS.
   if (user_manager::UserManager::IsInitialized()) {
     user_manager::User* user =
         user_manager::UserManager::Get()->GetActiveUser();
     if (user && user->is_profile_created())
       return profile_ == ProfileManager::GetActiveUserProfile();
   }
 #endif
   return true;
 }