Rename UI_API to UI_EXPORT.

ui/base/models/tree_model.h

Index: ui/base/models/tree_model.h
===================================================================
--- ui/base/models/tree_model.h	(revision 95624)
+++ ui/base/models/tree_model.h	(working copy)
@@ -9,7 +9,7 @@
 #include <vector>
 
 #include "base/string16.h"
-#include "ui/ui_api.h"
+#include "ui/base/ui_export.h"
 
 class SkBitmap;
 
@@ -30,7 +30,7 @@
 };
 
 // Observer for the TreeModel. Notified of significant events to the model.
-class UI_API TreeModelObserver {
+class UI_EXPORT TreeModelObserver {
  public:
   // Notification that nodes were added to the specified parent.
   virtual void TreeNodesAdded(TreeModel* model,
@@ -54,7 +54,7 @@
 // TreeModel ------------------------------------------------------------------
 
 // The model for TreeView.
-class UI_API TreeModel {
+class UI_EXPORT TreeModel {
  public:
   // Returns the root of the tree. This may or may not be shown in the tree,
   // see SetRootShown for details.