Remove PlatformEvent it is no longer used.

third_party/WebKit/Source/core/events/DragEvent.cpp

 // 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.
 
 #include "core/events/DragEvent.h"
 
 #include "core/clipboard/DataTransfer.h"
 #include "core/dom/Element.h"
 #include "core/events/EventDispatcher.h"
 
 namespace blink {
 
 DragEvent* DragEvent::create(const AtomicString& type,
                              bool canBubble,
                              bool cancelable,
                              AbstractView* view,
                              int detail,
                              int screenX,
                              int screenY,
                              int windowX,
                              int windowY,
                              int movementX,
                              int movementY,
-                             PlatformEvent::Modifiers modifiers,
+                             WebInputEvent::Modifiers modifiers,
                              short button,
                              unsigned short buttons,
                              EventTarget* relatedTarget,
                              TimeTicks platformTimeStamp,
                              DataTransfer* dataTransfer,
                              SyntheticEventType syntheticEventType) {
   return new DragEvent(type, canBubble, cancelable, view, detail, screenX,
                        screenY, windowX, windowY, movementX, movementY,
                        modifiers, button, buttons, relatedTarget,
                        platformTimeStamp, dataTransfer, syntheticEventType);
 }
 
 DragEvent::DragEvent() : m_dataTransfer(nullptr) {}
 
 DragEvent::DragEvent(DataTransfer* dataTransfer)
     : m_dataTransfer(dataTransfer) {}
 
 DragEvent::DragEvent(const AtomicString& eventType,
                      bool canBubble,
                      bool cancelable,
                      AbstractView* view,
                      int detail,
                      int screenX,
                      int screenY,
                      int windowX,
                      int windowY,
                      int movementX,
                      int movementY,
-                     PlatformEvent::Modifiers modifiers,
+                     WebInputEvent::Modifiers modifiers,
                      short button,
                      unsigned short buttons,
                      EventTarget* relatedTarget,
                      TimeTicks platformTimeStamp,
                      DataTransfer* dataTransfer,
                      SyntheticEventType syntheticEventType)
     : MouseEvent(
           eventType,
           canBubble,
           cancelable,
@@ skipping 52 matching lines @@
 }
 
 DispatchEventResult DragEventDispatchMediator::dispatchEvent(
     EventDispatcher& dispatcher) const {
   event().eventPath().adjustForRelatedTarget(dispatcher.node(),
                                              event().relatedTarget());
   return EventDispatchMediator::dispatchEvent(dispatcher);
 }
 
 }  // namespace blink