Optimization: not sending answer server requests for voice queries.

ui/app_list/search_box_model_observer.h

Index: ui/app_list/search_box_model_observer.h
diff --git a/ui/app_list/search_box_model_observer.h b/ui/app_list/search_box_model_observer.h
index b23a5f68e565800511bf471430f403b5743862c8..9dfd2e8992284bed4cfc886b317faf85b781bdf5 100644
--- a/ui/app_list/search_box_model_observer.h
+++ b/ui/app_list/search_box_model_observer.h
@@ -21,8 +21,8 @@ class APP_LIST_EXPORT SearchBoxModelObserver {
   // Invoked when selection model is changed.
   virtual void SelectionModelChanged() = 0;
 
-  // Invoked when text is changed.
-  virtual void TextChanged() = 0;
+  // Invoked when text or voice search flag is changed.
+  virtual void Update() = 0;
 
  protected:
   virtual ~SearchBoxModelObserver() {}