[ash-md] Erases the pre-MD code path for Overview Mode

ash/common/wm/overview/window_grid.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 ASH_COMMON_WM_OVERVIEW_WINDOW_GRID_H_
 #define ASH_COMMON_WM_OVERVIEW_WINDOW_GRID_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 57 matching lines @@
   // Layout is done in 2 stages maintaining fixed MRU ordering.
   // 1. Optimal height is determined. In this stage |height| is bisected to find
   //    maximum height which still allows all the windows to fit.
   // 2. Row widths are balanced. In this stage the available width is reduced
   //    until some windows are no longer fitting or until the difference between
   //    the narrowest and the widest rows starts growing.
   // Overall this achieves the goals of maximum size for previews (or maximum
   // row height which is equivalent assuming fixed height), balanced rows and
   // minimal wasted space.
   // Optionally animates the windows to their targets when |animate| is true.
-  void PositionWindowsMD(bool animate);
-
-  // Positions all the windows in the grid.
-  // Optionally animates the windows to their targets when |animate| is true.
   void PositionWindows(bool animate);
 
   // Updates |selected_index_| according to the specified |direction| and calls
   // MoveSelectionWidget(). Returns |true| if the new selection index is out of
   // this window grid bounds.
   bool Move(WindowSelector::Direction direction, bool animate);
 
   // Returns the target selected window, or NULL if there is none selected.
   WindowSelectorItem* SelectedWindow() const;
 
@@ skipping 62 matching lines @@
   // widest rows respectively. In-values of the |max_bottom|, |min_right| and
   // |max_right| parameters are ignored and their values are always initialized
   // inside this method. Returns true on success and false otherwise.
   bool FitWindowRectsInBounds(const gfx::Rect& bounds,
                               int height,
                               std::vector<gfx::Rect>* rects,
                               int* max_bottom,
                               int* min_right,
                               int* max_right);
 
-  // Sets up WindowSelectorItem to use masks or shapes based on command flags.
-  // TODO(varkha): remove this in the next patch and use shapes but not masks.
-  void PrepareForUsingMasksOrShapes(size_t windows_count) const;
-
   // Root window the grid is in.
   WmWindow* root_window_;
 
   // Pointer to the window selector that spawned this grid.
   WindowSelector* window_selector_;
 
   // Vector containing all the windows in this grid.
   ScopedVector<WindowSelectorItem> window_list_;
 
   ScopedObserver<WmWindow, WindowGrid> window_observer_;
@@ skipping 15 matching lines @@
 
   // True only after all windows have been prepared for overview.
   bool prepared_for_overview_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowGrid);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_OVERVIEW_WINDOW_GRID_H_