Remove redundant Mac event structures

Source/platform/PlatformWheelEvent.h

Index: Source/platform/PlatformWheelEvent.h
diff --git a/Source/platform/PlatformWheelEvent.h b/Source/platform/PlatformWheelEvent.h
index 57ca1012057614ba20bff42573aa8907eac3974a..7eebb25f43bd2eff3ea4270297a2f42631aec15b 100644
--- a/Source/platform/PlatformWheelEvent.h
+++ b/Source/platform/PlatformWheelEvent.h
@@ -66,9 +66,6 @@ public:
 #if OS(MACOSX)
         , m_phase(PlatformWheelEventPhaseNone)
         , m_momentumPhase(PlatformWheelEventPhaseNone)
-        , m_scrollCount(0)
-        , m_unacceleratedScrollingDeltaX(0)
-        , m_unacceleratedScrollingDeltaY(0)
         , m_canRubberbandLeft(true)
         , m_canRubberbandRight(true)
 #endif
@@ -88,9 +85,6 @@ public:
 #if OS(MACOSX)
         , m_phase(PlatformWheelEventPhaseNone)
         , m_momentumPhase(PlatformWheelEventPhaseNone)
-        , m_scrollCount(0)
-        , m_unacceleratedScrollingDeltaX(0)
-        , m_unacceleratedScrollingDeltaY(0)
         , m_canRubberbandLeft(true)
         , m_canRubberbandRight(true)
 #endif
@@ -113,9 +107,6 @@ public:
 #if OS(MACOSX)
     PlatformWheelEventPhase phase() const { return m_phase; }
     PlatformWheelEventPhase momentumPhase() const { return m_momentumPhase; }
-    unsigned scrollCount() const { return m_scrollCount; }
-    float unacceleratedScrollingDeltaX() const { return m_unacceleratedScrollingDeltaX; }
-    float unacceleratedScrollingDeltaY() const { return m_unacceleratedScrollingDeltaY; }
     bool useLatchedEventNode() const { return m_momentumPhase == PlatformWheelEventPhaseBegan || m_momentumPhase == PlatformWheelEventPhaseChanged; }
     bool canRubberbandLeft() const { return m_canRubberbandLeft; }
     bool canRubberbandRight() const { return m_canRubberbandRight; }
@@ -135,9 +126,6 @@ protected:
 #if OS(MACOSX)
     PlatformWheelEventPhase m_phase;
     PlatformWheelEventPhase m_momentumPhase;
-    unsigned m_scrollCount;
-    float m_unacceleratedScrollingDeltaX;
-    float m_unacceleratedScrollingDeltaY;
     bool m_canRubberbandLeft;
     bool m_canRubberbandRight;
 #endif