ui: Remove TouchStatus in favour of EventResult.

ash/wm/workspace/frame_maximize_button.cc

Index: ash/wm/workspace/frame_maximize_button.cc
diff --git a/ash/wm/workspace/frame_maximize_button.cc b/ash/wm/workspace/frame_maximize_button.cc
index 1e395de6a733bb9a03d411375ee1e5f348a5a278..876c82c7e69c4889c3adaca927fd49d6d8025a9b 100644
--- a/ash/wm/workspace/frame_maximize_button.cc
+++ b/ash/wm/workspace/frame_maximize_button.cc
@@ -51,7 +51,7 @@ class FrameMaximizeButton::EscapeEventFilter : public aura::EventFilter {
                                  ui::KeyEvent* event) OVERRIDE;
   virtual bool PreHandleMouseEvent(aura::Window* target,
                                    ui::MouseEvent* event) OVERRIDE;
-  virtual ui::TouchStatus PreHandleTouchEvent(
+  virtual ui::EventResult PreHandleTouchEvent(
       aura::Window* target,
       ui::TouchEvent* event) OVERRIDE;
   virtual ui::EventResult PreHandleGestureEvent(
@@ -90,10 +90,10 @@ bool FrameMaximizeButton::EscapeEventFilter::PreHandleMouseEvent(
   return false;
 }
 
-ui::TouchStatus FrameMaximizeButton::EscapeEventFilter::PreHandleTouchEvent(
+ui::EventResult FrameMaximizeButton::EscapeEventFilter::PreHandleTouchEvent(
     aura::Window* target,
     ui::TouchEvent* event) {
-  return ui::TOUCH_STATUS_UNKNOWN;
+  return ui::ER_UNHANDLED;
 }
 
 ui::EventResult FrameMaximizeButton::EscapeEventFilter::PreHandleGestureEvent(