Remove WebViewImpl helper methods for setting scroll offset.

Source/web/WebViewImpl.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 107 matching lines @@
     virtual void layoutAndPaintAsync(WebLayoutAndPaintAsyncCallback*) override;
     virtual void compositeAndReadbackAsync(WebCompositeAndReadbackAsyncCallback*) override;
     virtual bool isTrackingRepaints() const override;
     virtual void themeChanged() override;
     virtual bool handleInputEvent(const WebInputEvent&) override;
     virtual void setCursorVisibilityState(bool isVisible) override;
     virtual bool hasTouchEventHandlersAt(const WebPoint&) override;
 
     virtual void applyViewportDeltas(
         const WebFloatSize& pinchViewportDelta,
-        const WebFloatSize& mainFrameDelta,
+        const WebFloatSize& layoutViewportDelta,
         const WebFloatSize& elasticOverscrollDelta,
         float pageScaleDelta,
         float topControlsShownRatioDelta) override;
     virtual void recordFrameTimingEvent(enum FrameTimingEventType, int64_t, const WebVector<WebFrameTimingEvent>&) override;
     virtual void mouseCaptureLost() override;
     virtual void setFocus(bool enable) override;
     virtual bool setComposition(
         const WebString& text,
         const WebVector<WebCompositionUnderline>& underlines,
         int selectionStart,
@@ skipping 399 matching lines @@
 private:
     void setPageScaleFactorAndLocation(float, const FloatPoint&);
 
     void scrollAndRescaleViewports(float scaleFactor, const IntPoint& mainFrameOrigin, const FloatPoint& pinchViewportOrigin);
 
     float maximumLegiblePageScale() const;
     void refreshPageScaleFactorAfterLayout();
     void resumeTreeViewCommits();
     IntSize contentsSize() const;
 
-    void updateLayoutViewportScrollPosition(const DoublePoint& scrollPosition, bool programmaticScroll);
-
     void performResize();
     void resizeViewWhileAnchored(FrameView*);
 
     friend class WebView;  // So WebView::Create can call our constructor
     friend class WTF::RefCounted<WebViewImpl>;
     friend void setCurrentInputEventForTest(const WebInputEvent*);
 
     enum DragAction {
       DragEnter,
       DragOver
@@ skipping 206 matching lines @@
 };
 
 DEFINE_TYPE_CASTS(WebViewImpl, WebWidget, widget, widget->isWebView(), widget.isWebView());
 // We have no ways to check if the specified WebView is an instance of
 // WebViewImpl because WebViewImpl is the only implementation of WebView.
 DEFINE_TYPE_CASTS(WebViewImpl, WebView, webView, true, true);
 
 } // namespace blink
 
 #endif