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

third_party/WebKit/Source/platform/testing/TestingPlatformSupport.h

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 48 matching lines @@
 
     // WebScheduler implementation:
     WebTaskRunner* loadingTaskRunner() override;
     WebTaskRunner* timerTaskRunner() override;
     void shutdown() override {}
     bool shouldYieldForHighPriorityWork() override { return false; }
     bool canExceedIdleDeadlineIfRequired() override { return false; }
     void postIdleTask(const WebTraceLocation&, WebThread::IdleTask*) override { }
     void postNonNestableIdleTask(const WebTraceLocation&, WebThread::IdleTask*) override { }
     void postIdleTaskAfterWakeup(const WebTraceLocation&, WebThread::IdleTask*) override { }
-    WebPassOwnPtr<WebViewScheduler> createWebViewScheduler(blink::WebView*) override { return nullptr; }
+    std::unique_ptr<WebViewScheduler> createWebViewScheduler(blink::WebView*) override { return nullptr; }
     void suspendTimerQueue() override { }
     void resumeTimerQueue() override { }
     void addPendingNavigation() override { }
     void removePendingNavigation() override { }
     void onNavigationStarted() override { }
 
 private:
     WTF::Deque<OwnPtr<WebTaskRunner::Task>> m_tasks;
     OwnPtr<TestingPlatformMockWebTaskRunner> m_mockWebTaskRunner;
 };
@@ skipping 33 matching lines @@
     WebThread* currentThread() override;
     TestingPlatformMockScheduler* mockWebScheduler();
 
 protected:
     OwnPtr<TestingPlatformMockWebThread> m_mockWebThread;
 };
 
 } // namespace blink
 
 #endif // TestingPlatformSupport_h