Remove keyboard usability mode

ash/display/display_manager.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 ASH_DISPLAY_DISPLAY_MANAGER_H_
 #define ASH_DISPLAY_DISPLAY_MANAGER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 52 matching lines @@
     // When |clear_focus| is true, the implementation should
     // deactivate the active window and set the focus window to NULL.
     virtual void PreDisplayConfigurationChange(bool clear_focus) = 0;
     virtual void PostDisplayConfigurationChange() = 0;
   };
 
   // How the second display will be used.
   // 1) EXTENDED mode extends the desktop to the second dislpay.
   // 2) MIRRORING mode copies the content of the primary display to
   //    the 2nd display. (Software Mirroring).
-  // 3) In VIRTUAL_KEYBOARD mode, the 2nd display is used as a
-  //    dedicated display for virtual keyboard, and it is not
-  //    recognized as a part of desktop.
   enum SecondDisplayMode {
     EXTENDED,
-    MIRRORING,
-    VIRTUAL_KEYBOARD
+    MIRRORING
   };
 
   // Returns the list of possible UI scales for the display.
   static std::vector<float> GetScalesForDisplay(const DisplayInfo& info);
 
   // Returns next valid UI scale.
   static float GetNextUIScale(const DisplayInfo& info, bool up);
 
   // Updates the bounds of the display given by |secondary_display_id|
   // according to |layout|.
@@ skipping 194 matching lines @@
 
   // SoftwareMirroringController override:
 #if defined(OS_CHROMEOS)
   virtual void SetSoftwareMirroring(bool enabled) OVERRIDE;
   virtual bool SoftwareMirroringEnabled() const OVERRIDE;
 #endif
   bool software_mirroring_enabled() const {
     return second_display_mode_ == MIRRORING;
   };
 
-  bool virtual_keyboard_root_window_enabled() const {
-    return second_display_mode_ == VIRTUAL_KEYBOARD;
-  };
-
   // Sets/gets second display mode.
   void SetSecondDisplayMode(SecondDisplayMode mode);
   SecondDisplayMode second_display_mode() const {
     return second_display_mode_;
   }
 
   // Update the bounds of the display given by |display_id|.
   bool UpdateDisplayBounds(int64 display_id,
                            const gfx::Rect& new_bounds);
 
@@ skipping 92 matching lines @@
 
   // User preference for the rotation of the internal display.
   gfx::Display::Rotation registered_internal_display_rotation_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_DISPLAY_MANAGER_H_