Makes the launcher auto-hide for maximized windows. This turned out to

ash/wm/workspace/managed_workspace.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_WM_WORKSPACE_MANAGED_WORKSPACE_H_
 #define ASH_WM_WORKSPACE_MANAGED_WORKSPACE_H_
 
 #include "ash/wm/workspace/workspace.h"
 #include "base/compiler_specific.h"
 
 namespace ash {
 namespace internal {
 
 // ManagedWorkspace allows any non-maximized/fullscreen windows. It imposes
 // constraints on where the windows can be placed and how they can be resized.
 class ASH_EXPORT ManagedWorkspace : public Workspace {
  public:
   explicit ManagedWorkspace(WorkspaceManager* manager);
   virtual ~ManagedWorkspace();
 
  protected:
   // Workspace overrides:
   virtual bool CanAdd(aura::Window* window) const OVERRIDE;
   virtual void OnWindowAddedAfter(aura::Window* window,
                                   aura::Window* after) OVERRIDE;
   virtual void OnWindowRemoved(aura::Window* window) OVERRIDE;
-  virtual void OnWorkspaceSizeChanged(const gfx::Rect& old_bounds) OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ManagedWorkspace);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_WORKSPACE_MANAGED_WORKSPACE_H_