events: Update mouse-event handlers to not return EventResult.

ash/wm/window_manager_unittest.cc

Index: ash/wm/window_manager_unittest.cc
diff --git a/ash/wm/window_manager_unittest.cc b/ash/wm/window_manager_unittest.cc
index 773a4a6e37ee0166bd1fdc0ae66877cb4ade4476..2328850c6b9964298e67a55604762c9a74c95a2c 100644
--- a/ash/wm/window_manager_unittest.cc
+++ b/ash/wm/window_manager_unittest.cc
@@ -62,9 +62,12 @@ class CustomEventHandler : public aura::test::TestEventHandler {
       event->StopPropagation();
   }
 
-  virtual ui::EventResult OnMouseEvent(ui::MouseEvent* event) OVERRIDE {
-    ui::EventResult result = aura::test::TestEventHandler::OnMouseEvent(event);
-    return mouse_result_ == ui::ER_UNHANDLED ? result : mouse_result_;
+  virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE {
+    aura::test::TestEventHandler::OnMouseEvent(event);
+    if (mouse_result_ & ui::ER_HANDLED)
+      event->SetHandled();
+    if (mouse_result_ & ui::ER_CONSUMED)
+      event->StopPropagation();
   }
 
  private: