Remove WebContents methods that duplicate WebContentsView methods.

chrome/browser/ui/gtk/panels/panel_gtk.cc

Index: chrome/browser/ui/gtk/panels/panel_gtk.cc
diff --git a/chrome/browser/ui/gtk/panels/panel_gtk.cc b/chrome/browser/ui/gtk/panels/panel_gtk.cc
index 5423a77f66214dd62e8ac56da5f6351f2f4a51c5..3b9357695c2a7af1bfa528e4cfddce772de50762 100644
--- a/chrome/browser/ui/gtk/panels/panel_gtk.cc
+++ b/chrome/browser/ui/gtk/panels/panel_gtk.cc
@@ -29,6 +29,7 @@
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_view.h"
 #include "grit/theme_resources.h"
 #include "grit/ui_resources.h"
 #include "ui/base/accelerators/platform_accelerator_gtk.h"
@@ -941,7 +942,7 @@ void PanelGtk::PanelExpansionStateChanging(
 void PanelGtk::AttachWebContents(content::WebContents* contents) {
   if (!contents)
     return;
-  gfx::NativeView widget = contents->GetNativeView();
+  gfx::NativeView widget = contents->GetView()->GetNativeView();
   if (widget) {
     gtk_container_add(GTK_CONTAINER(contents_expanded_), widget);
     gtk_widget_show(widget);
@@ -950,7 +951,7 @@ void PanelGtk::AttachWebContents(content::WebContents* contents) {
 }
 
 void PanelGtk::DetachWebContents(content::WebContents* contents) {
-  gfx::NativeView widget = contents->GetNativeView();
+  gfx::NativeView widget = contents->GetView()->GetNativeView();
   if (widget) {
     GtkWidget* parent = gtk_widget_get_parent(widget);
     if (parent) {