Add --use-more-webui runtime flag to toggle WebUI replacements for native dialogs.

chrome/browser/ui/gtk/hung_renderer_dialog_gtk.cc

Index: chrome/browser/ui/gtk/hung_renderer_dialog_gtk.cc
diff --git a/chrome/browser/ui/gtk/hung_renderer_dialog_gtk.cc b/chrome/browser/ui/gtk/hung_renderer_dialog_gtk.cc
index 890166d24f139aa84e826ebdf6c13c5a993a679b..a4cae17a2f053b17dd5368e764339953a30cd2ce 100644
--- a/chrome/browser/ui/gtk/hung_renderer_dialog_gtk.cc
+++ b/chrome/browser/ui/gtk/hung_renderer_dialog_gtk.cc
@@ -249,7 +249,7 @@ void HungRendererDialogGtk::OnResponse(GtkWidget* dialog, int response_id) {
 
 namespace browser {
 
-void ShowHungRendererDialog(TabContents* contents) {
+void ShowNativeHungRendererDialog(TabContents* contents) {
   if (!logging::DialogsAreSuppressed()) {
     if (!g_instance)
       g_instance = new HungRendererDialogGtk();
@@ -257,7 +257,7 @@ void ShowHungRendererDialog(TabContents* contents) {
   }
 }
 
-void HideHungRendererDialog(TabContents* contents) {
+void HideNativeHungRendererDialog(TabContents* contents) {
   if (!logging::DialogsAreSuppressed() && g_instance)
     g_instance->EndForTabContents(contents);
 }