Replace views::Event with ui::Event.

ui/views/controls/button/custom_button.cc

Index: ui/views/controls/button/custom_button.cc
===================================================================
--- ui/views/controls/button/custom_button.cc	(revision 151055)
+++ ui/views/controls/button/custom_button.cc	(working copy)
@@ -295,14 +295,14 @@
 void CustomButton::StateChanged() {
 }
 
-bool CustomButton::IsTriggerableEvent(const Event& event) {
+bool CustomButton::IsTriggerableEvent(const ui::Event& event) {
   return event.type() == ui::ET_GESTURE_TAP_DOWN ||
          event.type() == ui::ET_GESTURE_TAP ||
          (event.IsMouseEvent() &&
              (triggerable_event_flags_ & event.flags()) != 0);
 }
 
-bool CustomButton::ShouldEnterPushedState(const Event& event) {
+bool CustomButton::ShouldEnterPushedState(const ui::Event& event) {
   return IsTriggerableEvent(event);
 }