Scroll offset pinning and content size notifications were only used for the Mac overlay navigation …

content/browser/renderer_host/render_view_host_impl.cc

Index: content/browser/renderer_host/render_view_host_impl.cc
diff --git a/content/browser/renderer_host/render_view_host_impl.cc b/content/browser/renderer_host/render_view_host_impl.cc
index ed4034d1be01d7d8ec7fb8d09cd69c6303812b70..2c43926e3cfc01b134d7b6480890298cdcba90c7 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -988,8 +988,6 @@ bool RenderViewHostImpl::OnMessageReceived(const IPC::Message& msg) {
                         OnDidContentsPreferredSizeChange)
     IPC_MESSAGE_HANDLER(ViewHostMsg_DidChangeScrollOffset,
                         OnDidChangeScrollOffset)
-    IPC_MESSAGE_HANDLER(ViewHostMsg_DidChangeScrollOffsetPinningForMainFrame,
-                        OnDidChangeScrollOffsetPinningForMainFrame)
     IPC_MESSAGE_HANDLER(ViewHostMsg_RouteCloseEvent,
                         OnRouteCloseEvent)
     IPC_MESSAGE_HANDLER(ViewHostMsg_RouteMessageEvent, OnRouteMessageEvent)
@@ -1217,12 +1215,6 @@ void RenderViewHostImpl::OnDidChangeScrollOffset() {
     view_->ScrollOffsetChanged();
 }
 
-void RenderViewHostImpl::OnDidChangeScrollOffsetPinningForMainFrame(
-    bool is_pinned_to_left, bool is_pinned_to_right) {
-  if (view_)
-    view_->SetScrollOffsetPinning(is_pinned_to_left, is_pinned_to_right);
-}
-
 void RenderViewHostImpl::OnRouteCloseEvent() {
   // Have the delegate route this to the active RenderViewHost.
   delegate_->RouteCloseEvent(this);