Move NativeWebKeyboardEvent to the content namespace.

content/browser/renderer_host/native_web_keyboard_event_mac.mm

 // Copyright (c) 2011 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 "content/public/browser/native_web_keyboard_event.h"
 
 #import <AppKit/AppKit.h>
 
 #include "third_party/WebKit/Source/WebKit/chromium/public/mac/WebInputEventFactory.h"
 
 using WebKit::WebInputEventFactory;
 
+namespace content {
+
 NativeWebKeyboardEvent::NativeWebKeyboardEvent()
     : os_event(NULL),
       skip_in_browser(false) {
 }
 
 NativeWebKeyboardEvent::NativeWebKeyboardEvent(gfx::NativeEvent native_event)
     : WebKeyboardEvent(WebInputEventFactory::keyboardEvent(native_event)),
       os_event([native_event retain]),
       skip_in_browser(false) {
 }
@@ skipping 24 matching lines @@
   [previous release];
 
   skip_in_browser = other.skip_in_browser;
 
   return *this;
 }
 
 NativeWebKeyboardEvent::~NativeWebKeyboardEvent() {
   [os_event release];
 }
+
+}  // namespace content