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

ui/events/gesture_event_details.h

Index: ui/events/gesture_event_details.h
diff --git a/ui/events/gesture_event_details.h b/ui/events/gesture_event_details.h
index 6a79a4ad1c12aa277a8078c880b7848e60d8ad7b..ff88041fb3eeb38819000f8072b2624938f38aab 100644
--- a/ui/events/gesture_event_details.h
+++ b/ui/events/gesture_event_details.h
@@ -5,17 +5,11 @@
 #ifndef UI_EVENTS_GESTURE_DETECTION_GESTURE_EVENT_DETAILS_H_
 #define UI_EVENTS_GESTURE_DETECTION_GESTURE_EVENT_DETAILS_H_
 
-#include <string.h>
-
 #include "base/logging.h"
 #include "ui/events/event_constants.h"
 #include "ui/events/events_base_export.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/rect_conversions.h"
-
-namespace IPC {
-template <class P> struct ParamTraits;
-}
 
 namespace ui {
 
@@ -143,14 +137,6 @@
     return data_.scroll_update.previous_update_in_sequence_prevented;
   }
 
-  // Supports comparison over internal structures for testing.
-  bool operator==(const GestureEventDetails& other) const {
-    return type_ == other.type_ &&
-           !memcmp(&data_, &other.data_, sizeof(Details)) &&
-           touch_points_ == other.touch_points_ &&
-           bounding_box_ == other.bounding_box_;
-  }
-
  private:
   EventType type_;
   union Details {
@@ -196,10 +182,6 @@
     int tap_count;  // TAP repeat count.
   } data_;
 
-  // For mojo native implementation of (de)serialization.
-  friend struct IPC::ParamTraits<ui::GestureEventDetails>;
-  friend struct IPC::ParamTraits<ui::GestureEventDetails::Details>;
-
   int touch_points_;  // Number of active touch points in the gesture.
 
   // Bounding box is an axis-aligned rectangle that contains all the