Make ui_controls only usable from interactive_ui_tests. This has two benefits:

chrome/test/base/ui_test_utils.cc

Index: chrome/test/base/ui_test_utils.cc
===================================================================
--- chrome/test/base/ui_test_utils.cc	(revision 176470)
+++ chrome/test/base/ui_test_utils.cc	(working copy)
@@ -73,7 +73,6 @@
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/size.h"
 #include "ui/snapshot/snapshot.h"
-#include "ui/ui_controls/ui_controls.h"
 
 #if defined(USE_AURA)
 #include "ash/shell.h"
@@ -671,19 +670,6 @@
   runner->Run();
 }
 
-namespace internal {
-
-void ClickTask(ui_controls::MouseButton button,
-               int state,
-               const base::Closure& followup) {
-  if (!followup.is_null())
-    ui_controls::SendMouseEventsNotifyWhenDone(button, state, followup);
-  else
-    ui_controls::SendMouseEvents(button, state);
-}
-
-}  // namespace internal
-
 HistoryEnumerator::HistoryEnumerator(Profile* profile) {
   scoped_refptr<content::MessageLoopRunner> message_loop_runner =
       new content::MessageLoopRunner;