Remove a number of unused features from WebViewImpl

sky/engine/public/platform/Platform.h

Index: sky/engine/public/platform/Platform.h
diff --git a/sky/engine/public/platform/Platform.h b/sky/engine/public/platform/Platform.h
index 17ab8b4359712200cfa6eb8fb104040518b2b68f..fd16511cb9573597747e899feae2bd9e84752970 100644
--- a/sky/engine/public/platform/Platform.h
+++ b/sky/engine/public/platform/Platform.h
@@ -59,8 +59,6 @@ class WebConvertableToTraceFormat;
 class WebDiscardableMemory;
 class WebFallbackThemeEngine;
 class WebFlingAnimator;
-class WebGestureCurveTarget;
-class WebGestureCurve;
 class WebGraphicsContext3DProvider;
 class WebSandboxSupport;
 struct WebFloatPoint;
@@ -355,10 +353,6 @@ public:
 
     virtual WebFlingAnimator* createFlingAnimator() { return 0; }
 
-    // Creates a new fling animation curve instance for device |deviceSource|
-    // with |velocity| and already scrolled |cumulativeScroll| pixels.
-    virtual WebGestureCurve* createFlingAnimationCurve(WebGestureDevice deviceSource, const WebFloatPoint& velocity, const WebSize& cumulativeScroll) { return 0; }
-
 protected:
     virtual ~Platform() { }
 };