Remove PlatformMouseEvent and use WebMouseEvent instead

third_party/WebKit/Source/core/page/AutoscrollController.cpp

Index: third_party/WebKit/Source/core/page/AutoscrollController.cpp
diff --git a/third_party/WebKit/Source/core/page/AutoscrollController.cpp b/third_party/WebKit/Source/core/page/AutoscrollController.cpp
index 748b48dae496bda3dd86c8dd11f616e1098f1c8c..86c673226055e75714c78140973fbce6c398de93 100644
--- a/third_party/WebKit/Source/core/page/AutoscrollController.cpp
+++ b/third_party/WebKit/Source/core/page/AutoscrollController.cpp
@@ -203,14 +203,13 @@ void AutoscrollController::updateDragAndDrop(Node* dropTargetNode,
 
 void AutoscrollController::handleMouseReleaseForMiddleClickAutoscroll(
     LocalFrame* frame,
-    const PlatformMouseEvent& mouseEvent) {
+    const WebMouseEvent& mouseEvent) {
   DCHECK(RuntimeEnabledFeatures::middleClickAutoscrollEnabled());
   if (!frame->isMainFrame())
     return;
   switch (m_autoscrollType) {
     case AutoscrollForMiddleClick:
-      if (mouseEvent.pointerProperties().button ==
-          WebPointerProperties::Button::Middle)
+      if (mouseEvent.button == WebPointerProperties::Button::Middle)
         m_autoscrollType = AutoscrollForMiddleClickCanStop;
       break;
     case AutoscrollForMiddleClickCanStop: