chrome/browser: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

chrome/browser/notifications/extension_welcome_notification.cc

Index: chrome/browser/notifications/extension_welcome_notification.cc
diff --git a/chrome/browser/notifications/extension_welcome_notification.cc b/chrome/browser/notifications/extension_welcome_notification.cc
index 5cb62ca43f67c1b85c7c78e275da9654d60cdc38..33b900a8263a80f4e25801743599f50e55efa41a 100644
--- a/chrome/browser/notifications/extension_welcome_notification.cc
+++ b/chrome/browser/notifications/extension_welcome_notification.cc
@@ -6,9 +6,11 @@
 
 #include "base/guid.h"
 #include "base/lazy_instance.h"
-#include "base/message_loop/message_loop.h"
+#include "base/location.h"
 #include "base/prefs/pref_service.h"
+#include "base/single_thread_task_runner.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/thread_task_runner_handle.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/notifications/notification.h"
 #include "chrome/browser/prefs/pref_service_syncable.h"
@@ -120,7 +122,7 @@ class DefaultDelegate : public ExtensionWelcomeNotification::Delegate {
 
   void PostTask(const tracked_objects::Location& from_here,
                 const base::Closure& task) override {
-    base::MessageLoop::current()->PostTask(from_here, task);
+    base::ThreadTaskRunnerHandle::Get()->PostTask(from_here, task);
   }
 
  private: