Add EventFilter for LauncherTooltip (2nd try).

ash/launcher/launcher_view.cc

Index: ash/launcher/launcher_view.cc
diff --git a/ash/launcher/launcher_view.cc b/ash/launcher/launcher_view.cc
index 20a513b042e2946c8d74c03e5f32d65c1f24c679..21b173b4d9c719669dcb2dca06c41847b5af5eee 100644
--- a/ash/launcher/launcher_view.cc
+++ b/ash/launcher/launcher_view.cc
@@ -283,7 +283,8 @@ LauncherView::LauncherView(LauncherModel* model,
   bounds_animator_->AddObserver(this);
   set_context_menu_controller(this);
   focus_search_.reset(new LauncherFocusSearch(view_model_.get()));
-  tooltip_.reset(new LauncherTooltipManager(alignment_, shelf_layout_manager));
+  tooltip_.reset(new LauncherTooltipManager(
+      alignment_, shelf_layout_manager, this));
 }
 
 LauncherView::~LauncherView() {
@@ -814,20 +815,6 @@ views::FocusTraversable* LauncherView::GetPaneFocusTraversable() {
   return this;
 }
 
-void LauncherView::OnMouseMoved(const views::MouseEvent& event) {
-  if (ShouldHideTooltip(event.location()) && tooltip_->IsVisible())
-    tooltip_->Close();
-}
-
-void LauncherView::OnMouseExited(const views::MouseEvent& event) {
-  // Mouse exit events are fired for entering to a launcher button from
-  // the launcher view, so it checks the location by ShouldHideTooltip().
-  gfx::Point point = event.location();
-  views::View::ConvertPointToView(parent(), this, &point);
-  if (ShouldHideTooltip(point) && tooltip_->IsVisible())
-    tooltip_->Close();
-}
-
 void LauncherView::LauncherItemAdded(int model_index) {
   model_index = CancelDrag(model_index);
   views::View* view = CreateViewForItem(model_->items()[model_index]);