Fix sticky keys crash when handling synthetic events without a native event.

ui/events/event.h

 // 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.
 
 #ifndef UI_EVENTS_EVENT_H_
 #define UI_EVENTS_EVENT_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/event_types.h"
@@ skipping 398 matching lines @@
   static const int kWheelDelta;
 
   explicit MouseWheelEvent(const base::NativeEvent& native_event);
   explicit MouseWheelEvent(const ScrollEvent& scroll_event);
   MouseWheelEvent(const MouseEvent& mouse_event, int x_offset, int y_offset);
   MouseWheelEvent(const MouseWheelEvent& mouse_wheel_event);
 
   template <class T>
   MouseWheelEvent(const MouseWheelEvent& model,
                   T* source,
-                  T* target,
-                  EventType type,
-                  int flags)
-      : MouseEvent(model, source, target, type, flags),
-        offset_(model.x_offset(), model.y_offset()){
+                  T* target)
+      : MouseEvent(model, source, target, model.type(), model.flags()),
+        offset_(model.x_offset(), model.y_offset()) {
   }
 
   // The amount to scroll. This is in multiples of kWheelDelta.
   // Note: x_offset() > 0/y_offset() > 0 means scroll left/up.
   int x_offset() const { return offset_.x(); }
   int y_offset() const { return offset_.y(); }
   const gfx::Vector2d& offset() const { return offset_; }
 
   // Overridden from LocatedEvent.
   virtual void UpdateForRootTransform(
@@ skipping 260 matching lines @@
   // The set of indices of ones in the binary representation of
   // touch_ids_bitfield_ is the set of touch_ids associate with this gesture.
   // This value is stored as a bitfield because the number of touch ids varies,
   // but we currently don't need more than 32 touches at a time.
   const unsigned int touch_ids_bitfield_;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_EVENT_H_