Add EventFilter for LauncherTooltip (2nd try).

ash/launcher/launcher_view.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_LAUNCHER_LAUNCHER_VIEW_H_
 #define ASH_LAUNCHER_LAUNCHER_VIEW_H_
 
 #include <utility>
 #include <vector>
 
@@ skipping 160 matching lines @@
 
   // Update first launcher button's padding. This method adds padding to the
   // first button to include the leading inset. It needs to be called once on
   // button creation and every time when shelf alignment is changed.
   void UpdateFirstButtonPadding();
 
   // Overridden from views::View:
   virtual gfx::Size GetPreferredSize() OVERRIDE;
   virtual void OnBoundsChanged(const gfx::Rect& previous_bounds) OVERRIDE;
   virtual FocusTraversable* GetPaneFocusTraversable() OVERRIDE;
-  virtual void OnMouseMoved(const views::MouseEvent& event) OVERRIDE;
-  virtual void OnMouseExited(const views::MouseEvent& event) OVERRIDE;
 
   // Overridden from LauncherModelObserver:
   virtual void LauncherItemAdded(int model_index) OVERRIDE;
   virtual void LauncherItemRemoved(int model_index, LauncherID id) OVERRIDE;
   virtual void LauncherItemChanged(int model_index,
                                    const ash::LauncherItem& old_item) OVERRIDE;
   virtual void LauncherItemMoved(int start_index, int target_index) OVERRIDE;
 
   // Overridden from LauncherButtonHost:
   virtual void PointerPressedOnButton(
@@ skipping 84 matching lines @@
   // alignment).
   int leading_inset_;
 
   DISALLOW_COPY_AND_ASSIGN(LauncherView);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_VIEW_H_