Remove obsolete pinch-zoom related code.

public/web/WebView.h

Index: public/web/WebView.h
diff --git a/public/web/WebView.h b/public/web/WebView.h
index fccabe0665136ae95826356965f6df2398e6b720..3adacccd889a5823725cd97133c740d03e0c6c52 100644
--- a/public/web/WebView.h
+++ b/public/web/WebView.h
@@ -230,12 +230,6 @@ public:
     // On the other hand, zooming affects layout of the page.
     virtual void setPageScaleFactor(float scaleFactor, const WebPoint& origin) { setPageScaleFactor(scaleFactor); }
 
-    // TODO: Reevaluate if this is needed once all users are converted to using the
-    // virtual viewport pinch model.
-    // Temporary to keep old style pinch viewport working while we gradually bring up
-    // virtual viewport pinch.
-    virtual void setMainFrameScrollOffset(const WebPoint& origin) = 0;
-
     // Scales the page without affecting layout by using the pinch-to-zoom viewport.
     virtual void setPageScaleFactor(float) = 0;