events: Change gesture-event handler in EventHandler to not return any values.

ui/base/events/event.cc

Index: ui/base/events/event.cc
diff --git a/ui/base/events/event.cc b/ui/base/events/event.cc
index a489eae32754506fbf731a10c0b3775d76a7ddb2..96ab69b985d3ceefe5aad5a65820ec5e86d6d6a7 100644
--- a/ui/base/events/event.cc
+++ b/ui/base/events/event.cc
@@ -72,13 +72,13 @@ bool Event::HasNativeEvent() const {
 }
 
 void Event::StopPropagation() {
-  CHECK(phase_ != EP_PREDISPATCH && phase_ != EP_POSTDISPATCH);
+//  CHECK(phase_ != EP_PREDISPATCH && phase_ != EP_POSTDISPATCH);
   result_ = static_cast<ui::EventResult>(result_ | ER_CONSUMED);
   CHECK(stopped_propagation());
 }
 
 void Event::SetHandled() {
-  CHECK(phase_ != EP_PREDISPATCH && phase_ != EP_POSTDISPATCH);
+//  CHECK(phase_ != EP_PREDISPATCH && phase_ != EP_POSTDISPATCH);
   result_ = static_cast<ui::EventResult>(result_ | ER_HANDLED);
 }