Split the event library into a cross-platform and native part. Part 1.

ui/events/cocoa/events_mac.mm

 // Copyright 2014 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/events/event_utils.h"
 
 #include <Cocoa/Cocoa.h>
 
 #import "base/mac/mac_util.h"
 #import "base/mac/sdk_forward_declarations.h"
@@ skipping 134 matching lines @@
     // values when scrolling up or to the left. Scrolling quickly results in a
     // higher delta per click, up to about 15.0. (Quartz documentation suggests
     // +/-10).
     // Multiply by 1000 to vaguely approximate WHEEL_DELTA on Windows (120).
     const CGFloat kWheelDeltaMultiplier = 1000;
     return gfx::Vector2d(kWheelDeltaMultiplier * [event deltaX],
                          kWheelDeltaMultiplier * [event deltaY]);
   }
 }
 
-base::NativeEvent CopyNativeEvent(const base::NativeEvent& event) {
-  return [event copy];
-}
-
-void ReleaseCopiedNativeEvent(const base::NativeEvent& event) {
-  [event release];
-}
-
 void IncrementTouchIdRefCount(const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();
 }
 
 void ClearTouchIdIfReleased(const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();
 }
 
 int GetTouchId(const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();
@@ skipping 92 matching lines @@
   uint16 return_value;
   [text getCharacters:&return_value];
   return return_value;
 }
 
 bool IsCharFromNative(const base::NativeEvent& native_event) {
   return false;
 }
 
 }  // namespace ui