Remove PlatformMouseEvent and use WebMouseEvent instead

third_party/WebKit/Source/platform/scroll/ScrollbarTheme.h

Index: third_party/WebKit/Source/platform/scroll/ScrollbarTheme.h
diff --git a/third_party/WebKit/Source/platform/scroll/ScrollbarTheme.h b/third_party/WebKit/Source/platform/scroll/ScrollbarTheme.h
index 948af5645e1bb58f8cfb22fb42a8b96ba43a9321..a7a5f702f1c91f91158936d7ad438c222d25741b 100644
--- a/third_party/WebKit/Source/platform/scroll/ScrollbarTheme.h
+++ b/third_party/WebKit/Source/platform/scroll/ScrollbarTheme.h
@@ -37,7 +37,7 @@ namespace blink {
 
 class CullRect;
 class GraphicsContext;
-class PlatformMouseEvent;
+class WebMouseEvent;
 
 class PLATFORM_EXPORT ScrollbarTheme {
   WTF_MAKE_NONCOPYABLE(ScrollbarTheme);
@@ -106,11 +106,11 @@ class PLATFORM_EXPORT ScrollbarTheme {
                               const IntRect&);
 
   virtual bool shouldCenterOnThumb(const ScrollbarThemeClient&,
-                                   const PlatformMouseEvent&);
+                                   const WebMouseEvent&);
   virtual bool shouldSnapBackToDragOrigin(const ScrollbarThemeClient&,
-                                          const PlatformMouseEvent&);
+                                          const WebMouseEvent&);
   virtual bool shouldDragDocumentInsteadOfThumb(const ScrollbarThemeClient&,
-                                                const PlatformMouseEvent&) {
+                                                const WebMouseEvent&) {
     return false;
   }