[Sync] Replace typedef with using.

chrome/browser/ui/sync/one_click_signin_sync_observer_unittest.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/ui/sync/one_click_signin_sync_observer.h"
 
 #include <memory>
 #include <string>
 #include <utility>
 
@@ skipping 74 matching lines @@
         sync_active_(false) {}
 
   bool first_setup_in_progress_;
   bool sync_active_;
 
   DISALLOW_COPY_AND_ASSIGN(OneClickTestProfileSyncService);
 };
 
 class TestOneClickSigninSyncObserver : public OneClickSigninSyncObserver {
  public:
-  typedef base::Callback<void(TestOneClickSigninSyncObserver*)>
-      DestructionCallback;
+  using DestructionCallback =
+      base::Callback<void(TestOneClickSigninSyncObserver*)>;
 
   TestOneClickSigninSyncObserver(content::WebContents* web_contents,
                                  const GURL& continue_url,
                                  const DestructionCallback& callback)
       : OneClickSigninSyncObserver(web_contents, continue_url),
         destruction_callback_(callback) {}
   ~TestOneClickSigninSyncObserver() override {
     destruction_callback_.Run(this);
   }
 
@@ skipping 174 matching lines @@
   if (content::IsBrowserSideNavigationEnabled()) {
     EXPECT_CALL(*web_contents_observer_, DidStartNavigation(_)).Times(0);
     sync_service_->NotifyObservers();
   } else {
     EXPECT_CALL(*web_contents_observer_,
                 DidStartNavigationToPendingEntry(_, _)).Times(0);
     sync_service_->NotifyObservers();
   }
   EXPECT_NE(GURL(kContinueUrl), web_contents()->GetVisibleURL());
 }