Replace views::Event with ui::Event.

ash/system/date/date_view.cc

Index: ash/system/date/date_view.cc
===================================================================
--- ash/system/date/date_view.cc	(revision 151055)
+++ ash/system/date/date_view.cc	(working copy)
@@ -134,7 +134,7 @@
   day_of_week_label_->SetText(FormatDayOfWeek(now));
 }
 
-bool DateView::PerformAction(const views::Event& event) {
+bool DateView::PerformAction(const ui::Event& event) {
   if (!actionable_)
     return false;
 
@@ -194,7 +194,7 @@
   Layout();
 }
 
-bool TimeView::PerformAction(const views::Event& event) {
+bool TimeView::PerformAction(const ui::Event& event) {
   return false;
 }