Fix grammatical errors in comments in ui/views

ui/views/controls/tree/tree_view_views.cc

Index: ui/views/controls/tree/tree_view_views.cc
diff --git a/ui/views/controls/tree/tree_view_views.cc b/ui/views/controls/tree/tree_view_views.cc
index 42346768a7977a4dde9f04ccb3e7a7f1be38d1d8..92a6c2b4fa068be1bbfaa6d6f68ba200bb48c521 100644
--- a/ui/views/controls/tree/tree_view_views.cc
+++ b/ui/views/controls/tree/tree_view_views.cc
@@ -391,7 +391,7 @@ void TreeView::TreeNodesRemoved(TreeModel* model,
   }
   if (reset_selection) {
     // selected_node_ is no longer valid (at the time we enter this function
-    // it's model_node() is likely deleted). Explicitly NULL out the field
+    // its model_node() is likely deleted). Explicitly NULL out the field
     // rather than invoking SetSelectedNode() otherwise, we'll try and use a
     // deleted value.
     selected_node_ = NULL;