MacViewsBrowser: Fix omnibox crash due to failed DCHECK.

ui/views/controls/textfield/textfield_test_api.h

Index: ui/views/controls/textfield/textfield_test_api.h
diff --git a/ui/views/controls/textfield/textfield_test_api.h b/ui/views/controls/textfield/textfield_test_api.h
index 4505b71290700891866ea2a4820c8514f8cf2cda..3b3555fa54e4e6391c9e011e1c95cebbad2232df 100644
--- a/ui/views/controls/textfield/textfield_test_api.h
+++ b/ui/views/controls/textfield/textfield_test_api.h
@@ -33,6 +33,10 @@ class TextfieldTestApi {
     return textfield_->touch_selection_controller_.get();
   }
 
+  ui::TextEditCommand scheduled_text_edit_command() const {
+    return textfield_->scheduled_text_edit_command_;
+  }
+
  private:
   Textfield* textfield_;