Remove unnecessary |show_on_tap_for_empty_editable| flag

ui/touch_selection/touch_selection_controller.h

 // Copyright 2014 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_TOUCH_SELECTION_TOUCH_SELECTION_CONTROLLER_H_
 #define UI_TOUCH_SELECTION_TOUCH_SELECTION_CONTROLLER_H_
 
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "ui/gfx/geometry/point_f.h"
@@ skipping 46 matching lines @@
     // Defaults to 8 DIPs.
     float tap_slop;
 
     // Controls whether adaptive orientation for selection handles is enabled.
     // Defaults to false.
     bool enable_adaptive_handle_orientation;
 
     // Controls whether drag selection after a longpress is enabled.
     // Defaults to false.
     bool enable_longpress_drag_selection;
-
-    // Controls whether an insertion handle is shown on a tap for an empty
-    // editable text. Defauls to false.
-    // TODO(mohsen): This flag used to be set to |true| on Aura. That's not the
-    // case anymore and it is always |false|. Consider removing it.
-    bool show_on_tap_for_empty_editable;
   };
 
   TouchSelectionController(TouchSelectionControllerClient* client,
                            const Config& config);
   ~TouchSelectionController() override;
 
   // To be called when the selection bounds have changed.
   // Note that such updates will trigger handle updates only if preceded
   // by an appropriate call to allow automatic showing.
   void OnSelectionBoundsChanged(const gfx::SelectionBound& start,
@@ skipping 162 matching lines @@
   // Whether a selection handle was dragged during the current 'selection
   // session' - i.e. since the current selection has been activated.
   bool selection_handle_dragged_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchSelectionController);
 };
 
 }  // namespace ui
 
 #endif  // UI_TOUCH_SELECTION_TOUCH_SELECTION_CONTROLLER_H_