Remove more frame-level scrolling machinery.

sky/engine/public/web/WebFrame.h

Index: sky/engine/public/web/WebFrame.h
diff --git a/sky/engine/public/web/WebFrame.h b/sky/engine/public/web/WebFrame.h
index 48c1361d09cb6fde8e0ce1224299dad866e28bb1..9f5a281b16b40fe6ce5944b3240d0252a5ec09cc 100644
--- a/sky/engine/public/web/WebFrame.h
+++ b/sky/engine/public/web/WebFrame.h
@@ -104,13 +104,6 @@ public:
     // NOTE: These routines do not force page layout so their results may
     // not be accurate if the page layout is out-of-date.
 
-    // The scroll offset from the top-left corner of the frame in pixels.
-    virtual WebSize scrollOffset() const = 0;
-
-    // The minimum and maxium scroll positions in pixels.
-    virtual WebSize minimumScrollOffset() const = 0;
-    virtual WebSize maximumScrollOffset() const = 0;
-
     // The size of the contents area.
     virtual WebSize contentsSize() const = 0;