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

ui/base/events/event.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/base/events/event.h"
 
 #if defined(USE_X11)
 #include <X11/Xlib.h>
 #endif
 
@@ skipping 54 matching lines @@
 #endif
 }
 
 bool Event::HasNativeEvent() const {
   base::NativeEvent null_event;
   std::memset(&null_event, 0, sizeof(null_event));
   return !!std::memcmp(&native_event_, &null_event, sizeof(null_event));
 }
 
 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);
 }
 
 Event::Event(EventType type, base::TimeDelta time_stamp, int flags)
     : type_(type),
       time_stamp_(time_stamp),
       flags_(flags),
       delete_native_event_(false),
       target_(NULL),
       phase_(EP_PREDISPATCH),
@@ skipping 471 matching lines @@
 int GestureEvent::GetLowestTouchId() const {
   if (touch_ids_bitfield_ == 0)
     return -1;
   int i = -1;
   // Find the index of the least significant 1 bit
   while (!(1 << ++i & touch_ids_bitfield_));
   return i;
 }
 
 }  // namespace ui