Firefox overlay is seen opened even if Import Overlay is Cancelled.

chrome/browser/ui/views/importer/import_lock_dialog_view.cc

Index: chrome/browser/ui/views/importer/import_lock_dialog_view.cc
diff --git a/chrome/browser/ui/views/importer/import_lock_dialog_view.cc b/chrome/browser/ui/views/importer/import_lock_dialog_view.cc
index 061fceb48ea3a6ac4271d93e229ccfcf97703c79..199e86068e32f58aa8e980a5a1a0c282ef8017a1 100644
--- a/chrome/browser/ui/views/importer/import_lock_dialog_view.cc
+++ b/chrome/browser/ui/views/importer/import_lock_dialog_view.cc
@@ -30,13 +30,26 @@ void ShowImportLockDialog(gfx::NativeWindow parent,
   content::RecordAction(UserMetricsAction("ImportLockDialogView_Shown"));
 }
 
+void HideImportLockDialog() {
+  ImportLockDialogView::Hide();
 }  // namespace importer
 
+views::Widget* ImportLockDialogView::m_widget = NULL;
+
+// static
+void ImportLockDialogView::Hide() {
+  if (m_widget) {
+    m_widget->Hide();
+    m_widget->CloseNow();
+  }
+}
+
 // static
 void ImportLockDialogView::Show(gfx::NativeWindow parent,
                                 const base::Callback<void(bool)>& callback) {
-  views::DialogDelegate::CreateDialogWidget(
-      new ImportLockDialogView(callback), NULL, NULL)->Show();
+  m_widget = views::DialogDelegate::CreateDialogWidget(
+      new ImportLockDialogView(callback), NULL, NULL);
+  m_widget->Show();
 }
 
 ImportLockDialogView::ImportLockDialogView(