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

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 773a0701c9959b9e6bf76ec4b5e5e82b07baca0a..cb5766702ab29659b7ed4e58705c9e8d3eb98ed2 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -396,10 +396,6 @@ RenderWidget::RenderWidget(blink::WebPopupType popup_type,
       outstanding_ime_acks_(0),
       body_background_color_(SK_ColorWHITE),
 #endif
-#if defined(OS_MACOSX)
-      cached_has_main_frame_horizontal_scrollbar_(false),
-      cached_has_main_frame_vertical_scrollbar_(false),
-#endif
       popup_origin_scale_for_emulation_(0.f),
       resizing_mode_selector_(new ResizingModeSelector()),
       context_menu_source_type_(ui::MENU_SOURCE_MOUSE) {
@@ -1902,21 +1898,6 @@ bool RenderWidget::CanComposeInline() {
   return true;
 }
 
-#if defined(OS_MACOSX)
-void RenderWidget::DidChangeScrollbarsForMainFrame(
-    bool has_horizontal_scrollbar,
-    bool has_vertical_scrollbar) {
-  if (has_horizontal_scrollbar != cached_has_main_frame_horizontal_scrollbar_ ||
-      has_vertical_scrollbar != cached_has_main_frame_vertical_scrollbar_) {
-    Send(new ViewHostMsg_DidChangeScrollbarsForMainFrame(
-          routing_id_, has_horizontal_scrollbar, has_vertical_scrollbar));
-
-    cached_has_main_frame_horizontal_scrollbar_ = has_horizontal_scrollbar;
-    cached_has_main_frame_vertical_scrollbar_ = has_vertical_scrollbar;
-  }
-}
-#endif  // defined(OS_MACOSX)
-
 WebScreenInfo RenderWidget::screenInfo() {
   return screen_info_;
 }