Remove WebScroll*

sky/viewer/platform/platform_impl.cc

Index: sky/viewer/platform/platform_impl.cc
diff --git a/sky/viewer/platform/platform_impl.cc b/sky/viewer/platform/platform_impl.cc
index 001053156391bd2cd2b2c6d2e2f4996cd08d13af..2315c4560d35d921da38259599ef7b6c8fb6c7cd 100644
--- a/sky/viewer/platform/platform_impl.cc
+++ b/sky/viewer/platform/platform_impl.cc
@@ -126,10 +126,6 @@ blink::WebCompositorSupport* PlatformImpl::compositorSupport() {
   return &compositor_support_;
 }
 
-blink::WebScrollbarBehavior* PlatformImpl::scrollbarBehavior() {
-  return &scrollbar_behavior_;
-}
-
 mojo::NetworkService* PlatformImpl::networkService() {
   return network_service_.get();
 }