Fix classes that have too many virtuals for inline constructors.

ui/views/controls/textfield/textfield_controller.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_CONTROLLER_H_
 #define UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_CONTROLLER_H_
 
 #include <set>
 
 #include "base/strings/string16.h"
@@ skipping 62 matching lines @@
   // Called when a drop of dragged data happens on the textfield. This method is
   // called before regular handling of the drop. If this returns a drag
   // operation other than |ui::DragDropTypes::DRAG_NONE|, regular handling is
   // skipped.
   virtual int OnDrop(const ui::OSExchangeData& data);
 
   // Gives the controller a chance to modify the context menu contents.
   virtual void UpdateContextMenu(ui::SimpleMenuModel* menu_contents) {}
 
  protected:
+  TextfieldController() = default;
   virtual ~TextfieldController() {}
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_CONTROLLER_H_