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

third_party/WebKit/Source/modules/webusb/USB.h

 // Copyright 2015 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 USB_h
 #define USB_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/dom/ContextLifecycleObserver.h"
@@ skipping 30 matching lines @@
     DEFINE_ATTRIBUTE_EVENT_LISTENER(disconnect);
 
     // EventTarget overrides.
     ExecutionContext* getExecutionContext() const override;
     const AtomicString& interfaceName() const override;
 
     // ContextLifecycleObserver overrides.
     void contextDestroyed() override;
 
     // WebUSBClient::Observer overrides.
-    void onDeviceConnected(WebPassOwnPtr<WebUSBDevice>) override;
-    void onDeviceDisconnected(WebPassOwnPtr<WebUSBDevice>) override;
+    void onDeviceConnected(std::unique_ptr<WebUSBDevice>) override;
+    void onDeviceDisconnected(std::unique_ptr<WebUSBDevice>) override;
 
     DECLARE_VIRTUAL_TRACE();
     EAGERLY_FINALIZE();
 
 private:
     explicit USB(LocalFrame& frame);
 
     WebUSBClient* m_client;
 };
 
 } // namespace blink
 
 #endif // USB_h