Nuke WebPassOwnPtr<T> and replace it with std::unique_ptr<T>.

third_party/WebKit/public/platform/modules/installedapp/WebInstalledAppClient.h

 // Copyright 2016 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 WebInstalledAppClient_h
 #define WebInstalledAppClient_h
 
 #include "public/platform/WebCallbacks.h"
 #include "public/platform/WebSecurityOrigin.h"
 #include "public/platform/WebVector.h"
 #include "public/platform/modules/installedapp/WebRelatedApplication.h"
 
 namespace blink {
 
 using AppInstalledCallbacks = WebCallbacks<const WebVector<WebRelatedApplication>&, void>;
 
 class WebInstalledAppClient {
 public:
     virtual ~WebInstalledAppClient() {}
 
     // Takes ownership of the AppInstalledCallbacks.
-    virtual void getInstalledRelatedApps(const WebSecurityOrigin&, WebPassOwnPtr<AppInstalledCallbacks>) = 0;
+    virtual void getInstalledRelatedApps(const WebSecurityOrigin&, std::unique_ptr<AppInstalledCallbacks>) = 0;
 };
 
 } // namespace blink
 
 #endif // WebInstalledAppClient_h