Revert of IPC::ParamTraits for ui::Event (towards ui::Events over mojo IPC)

ui/events/event.h

Index: ui/events/event.h
diff --git a/ui/events/event.h b/ui/events/event.h
index bb98f7ec8ae85bb36c8c3560dc48d5470cd772bb..1679dc03f944a8f2feaff85691e91191e391c7be 100644
--- a/ui/events/event.h
+++ b/ui/events/event.h
@@ -6,6 +6,7 @@
 #define UI_EVENTS_EVENT_H_
 
 #include <stdint.h>
+
 #include "base/compiler_specific.h"
 #include "base/event_types.h"
 #include "base/gtest_prod_util.h"
@@ -26,10 +27,6 @@
 class Transform;
 }
 
-namespace IPC {
-template <class P> struct ParamTraits;
-}
-
 namespace ui {
 class EventTarget;
 class KeyEvent;
@@ -37,10 +34,6 @@
 class PointerEvent;
 class TouchEvent;
 enum class DomCode;
-class Event;
-class MouseWheelEvent;
-
-using ScopedEvent = scoped_ptr<Event>;
 
 class EVENTS_EXPORT Event {
  public:
@@ -276,9 +269,6 @@
  private:
   friend class EventTestApi;
 
-  // For (de)serialization.
-  friend struct IPC::ParamTraits<ui::ScopedEvent>;
-
   EventType type_;
   std::string name_;
   base::TimeDelta time_stamp_;
@@ -300,13 +290,6 @@
  public:
   CancelModeEvent();
   ~CancelModeEvent() override;
-
- private:
-  // For (de)serialization.
-  CancelModeEvent(EventType type, base::TimeDelta time_stamp, int flags)
-      : Event(type, time_stamp, flags) {}
-  friend struct IPC::ParamTraits<ui::ScopedEvent>;
-  friend struct IPC::ParamTraits<ui::CancelModeEvent>;
 };
 
 class EVENTS_EXPORT LocatedEvent : public Event {
@@ -350,13 +333,6 @@
 
  protected:
   friend class LocatedEventTestApi;
-
-  // For (de)serialization.
-  LocatedEvent(EventType type, base::TimeDelta time_stamp, int flags)
-      : Event(type, time_stamp, flags) {}
-  friend struct IPC::ParamTraits<ui::ScopedEvent>;
-  friend struct IPC::ParamTraits<ui::LocatedEvent>;
-
   explicit LocatedEvent(const base::NativeEvent& native_event);
 
   // Create a new LocatedEvent which is identical to the provided model.
@@ -417,9 +393,6 @@
            tilt_y == other.tilt_y;
   }
 
-  // For serialization.
-  friend struct IPC::ParamTraits<ui::PointerDetails>;
-
   // The type of pointer device.
   EventPointerType pointer_type = EventPointerType::POINTER_TYPE_UNKNOWN;
 
@@ -539,13 +512,6 @@
     pointer_details_ = details;
   }
 
- protected:
-  // For (de)serialization.
-  MouseEvent(EventType type, base::TimeDelta time_stamp, int flags)
-      : LocatedEvent(type, time_stamp, flags) {}
-  friend struct IPC::ParamTraits<ui::ScopedEvent>;
-  friend struct IPC::ParamTraits<ui::MouseEvent>;
-
  private:
   FRIEND_TEST_ALL_PREFIXES(EventTest, DoubleClickRequiresRelease);
   FRIEND_TEST_ALL_PREFIXES(EventTest, SingleClickRightLeft);
@@ -606,12 +572,6 @@
   const gfx::Vector2d& offset() const { return offset_; }
 
  private:
-  // For (de)serialization.
-  MouseWheelEvent(EventType type, base::TimeDelta time_stamp, int flags)
-      : MouseEvent(type, time_stamp, flags) {}
-  friend struct IPC::ParamTraits<ui::ScopedEvent>;
-  friend struct IPC::ParamTraits<ui::MouseWheelEvent>;
-
   gfx::Vector2d offset_;
 };
 
@@ -684,22 +644,15 @@
   }
 
  private:
-  // For (de)serialization.
-  TouchEvent(EventType type, base::TimeDelta time_stamp, int flags)
-      : LocatedEvent(type, time_stamp, flags),
-        should_remove_native_touch_id_mapping_(false) {}
-  friend struct IPC::ParamTraits<ui::ScopedEvent>;
-  friend struct IPC::ParamTraits<ui::TouchEvent>;
-
   // Adjusts rotation_angle_ to within the acceptable range.
   void FixRotationAngle();
 
   // The identity (typically finger) of the touch starting at 0 and incrementing
   // for each separable additional touch that the hardware can detect.
-  int touch_id_;
+  const int touch_id_;
 
   // A unique identifier for the touch event.
-  uint32_t unique_event_id_;
+  const uint32_t unique_event_id_;
 
   // Clockwise angle (in degrees) of the major axis from the X axis. Must be
   // less than 180 and non-negative.
@@ -909,11 +862,6 @@
   void set_is_char(bool is_char) { is_char_ = is_char; }
 
  private:
-  // For (de)serialization.
-  KeyEvent(EventType type, base::TimeDelta time_stamp, int flags);
-  friend struct IPC::ParamTraits<ui::ScopedEvent>;
-  friend struct IPC::ParamTraits<ui::KeyEvent>;
-
   // Determine key_ on a keystroke event from code_ and flags().
   void ApplyLayout() const;
 
@@ -992,12 +940,6 @@
   int finger_count() const { return finger_count_; }
 
  private:
-  // For (de)serialization.
-  ScrollEvent(EventType type, base::TimeDelta time_stamp, int flags)
-      : MouseEvent(type, time_stamp, flags) {}
-  friend struct IPC::ParamTraits<ui::ScopedEvent>;
-  friend struct IPC::ParamTraits<ui::ScrollEvent>;
-
   // Potential accelerated offsets.
   float x_offset_;
   float y_offset_;
@@ -1030,12 +972,6 @@
   const GestureEventDetails& details() const { return details_; }
 
  private:
-  // For (de)serialization.
-  GestureEvent(EventType type, base::TimeDelta time_stamp, int flags)
-      : LocatedEvent(type, time_stamp, flags) {}
-  friend struct IPC::ParamTraits<ui::ScopedEvent>;
-  friend struct IPC::ParamTraits<ui::GestureEvent>;
-
   GestureEventDetails details_;
 };