Don't fire a FOCUS accessibility event on a View that doesn't have focus.

ash/wm/overview/window_selector_item.h

Index: ash/wm/overview/window_selector_item.h
diff --git a/ash/wm/overview/window_selector_item.h b/ash/wm/overview/window_selector_item.h
index d7949d9437e6bd495144ecc1f8c9183e6932dcc9..36ab26dbe50bebce232b5be8c0ee3d8c87f250c9 100644
--- a/ash/wm/overview/window_selector_item.h
+++ b/ash/wm/overview/window_selector_item.h
@@ -86,9 +86,10 @@ class ASH_EXPORT WindowSelectorItem : public views::ButtonListener,
   // dispatched when the bounds of a window change.
   void RecomputeWindowTransforms();
 
-  // Sends an a11y focus alert so that, if chromevox is enabled, the window
-  // label is read.
-  void SendFocusAlert() const;
+  // Sends an accessibility event indicating that this window became selected
+  // so that it's highlighted and announced if accessibility features are
+  // enabled.
+  void SendAccessibleSelectionEvent();
 
   // Sets if the item is dimmed in the overview. Changing the value will also
   // change the visibility of the transform windows.