Remove PlatformMouseEvent and use WebMouseEvent instead

third_party/WebKit/Source/core/layout/LayoutScrollbarTheme.h

Index: third_party/WebKit/Source/core/layout/LayoutScrollbarTheme.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutScrollbarTheme.h b/third_party/WebKit/Source/core/layout/LayoutScrollbarTheme.h
index c9b96ebebe0203e61654ff5a1499d5f9f15d4d03..de89c064fee666ef12d12ccaee37b30897be9e1d 100644
--- a/third_party/WebKit/Source/core/layout/LayoutScrollbarTheme.h
+++ b/third_party/WebKit/Source/core/layout/LayoutScrollbarTheme.h
@@ -30,7 +30,7 @@
 
 namespace blink {
 
-class PlatformMouseEvent;
+class WebMouseEvent;
 
 class LayoutScrollbarTheme final : public ScrollbarTheme {
  public:
@@ -49,11 +49,11 @@ class LayoutScrollbarTheme final : public ScrollbarTheme {
                          const IntRect& cornerRect) override;
 
   bool shouldCenterOnThumb(const ScrollbarThemeClient& scrollbar,
-                           const PlatformMouseEvent& event) override {
+                           const WebMouseEvent& event) override {
     return ScrollbarTheme::theme().shouldCenterOnThumb(scrollbar, event);
   }
   bool shouldSnapBackToDragOrigin(const ScrollbarThemeClient& scrollbar,
-                                  const PlatformMouseEvent& event) override {
+                                  const WebMouseEvent& event) override {
     return ScrollbarTheme::theme().shouldSnapBackToDragOrigin(scrollbar, event);
   }