If no locale data files can be found, show a dialog and exit

chrome/browser/browser_main_gtk.cc

Index: chrome/browser/browser_main_gtk.cc
diff --git a/chrome/browser/browser_main_gtk.cc b/chrome/browser/browser_main_gtk.cc
index 98480e0516a90811ac71283e4a350dd6caeaf9da..0e48993e4c5812a4341374ae509e3ee9fcea05da 100644
--- a/chrome/browser/browser_main_gtk.cc
+++ b/chrome/browser/browser_main_gtk.cc
@@ -179,6 +179,21 @@ void WarnAboutMinimumSystemRequirements() {
   // Nothing to warn about on GTK right now.
 }
 
+void ShowMissingLocaleMessageBox(const char* message, const char* title) {
+  GtkWidget* dialog = gtk_message_dialog_new(
+      NULL,
+      static_cast<GtkDialogFlags>(0),
+      GTK_MESSAGE_ERROR,
+      GTK_BUTTONS_CLOSE,
+      "%s",
+      message);
+
+  gtk_window_set_title(GTK_WINDOW(dialog), title);
+
+  gtk_dialog_run(GTK_DIALOG(dialog));
+  gtk_widget_destroy(dialog);
+}
+
 void RecordBrowserStartupTime() {
   // Not implemented on GTK for now.
 }