Remove GraphicsLayer::didScroll and directly call ScrollableArea::didScroll

cc/blink/web_layer_impl.h

Index: cc/blink/web_layer_impl.h
diff --git a/cc/blink/web_layer_impl.h b/cc/blink/web_layer_impl.h
index 1d8c2a091ece64b348890947e44d1b4162860f9f..2401f1ac88821c55aa6965dbaaa42d3338979383 100644
--- a/cc/blink/web_layer_impl.h
+++ b/cc/blink/web_layer_impl.h
@@ -89,8 +89,8 @@ class CC_BLINK_EXPORT WebLayerImpl : public NON_EXPORTED_BASE(blink::WebLayer) {
   void setFiltersOrigin(const blink::WebFloatPoint& origin) override;
   void setBackgroundFilters(const cc::FilterOperations& filters) override;
   bool hasTickingAnimationForTesting() override;
-  void setScrollPositionDouble(blink::WebDoublePoint position) override;
-  blink::WebDoublePoint scrollPositionDouble() const override;
+  void setScrollPosition(blink::WebFloatPoint position) override;
+  blink::WebFloatPoint scrollPosition() const override;
   void setScrollClipLayer(blink::WebLayer* clip_layer) override;
   bool scrollable() const override;
   void setUserScrollable(bool horizontal, bool vertical) override;