Remove JS dialog dependency from content.

chrome/browser/external_tab_container_win.cc

Index: chrome/browser/external_tab_container_win.cc
diff --git a/chrome/browser/external_tab_container_win.cc b/chrome/browser/external_tab_container_win.cc
index 7bb07552d0ea4bcaeb6b232772e5741b9754fdc8..bff1403fc6c210dc3177416d4a8f1bdf75afe7e0 100644
--- a/chrome/browser/external_tab_container_win.cc
+++ b/chrome/browser/external_tab_container_win.cc
@@ -21,6 +21,7 @@
 #include "chrome/browser/history/history_tab_helper.h"
 #include "chrome/browser/page_info_window.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/app_modal_dialogs/message_box_handler.h"
 #include "chrome/browser/ui/blocked_content/blocked_content_tab_helper.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_window.h"
@@ -593,6 +594,11 @@ void ExternalTabContainer::UnregisterRenderViewHost(
   }
 }
 
+content::JavaScriptDialogCreator*
+ExternalTabContainer::GetJavaScriptDialogCreator() {
+  return GetJavaScriptDialogCreatorInstance();
+}
+
 bool ExternalTabContainer::HandleContextMenu(const ContextMenuParams& params) {
   if (!automation_) {
     NOTREACHED();