[ObjC ARC] Converts ios/chrome/browser/ui:ui to ARC.

ios/chrome/browser/ui/native_content_controller.mm

 // Copyright 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.
 
 #import "ios/chrome/browser/ui/native_content_controller.h"
 
 #import <UIKit/UIKit.h>
 
 #include "base/mac/bundle_locations.h"
 #import "base/mac/foundation_util.h"
-#include "base/mac/objc_property_releaser.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
 
 @implementation NativeContentController {
   GURL _url;
-  base::mac::ObjCPropertyReleaser _propertyReleaser_NativeContentController;
 }
 
 @synthesize view = _view;
 @synthesize title = _title;
 @synthesize url = _url;
 
 - (instancetype)initWithNibName:(NSString*)nibName url:(const GURL&)url {
   self = [super init];
   if (self) {
-    _propertyReleaser_NativeContentController.Init(
-        self, [NativeContentController class]);
     if (nibName.length) {
       [base::mac::FrameworkBundle() loadNibNamed:nibName
                                            owner:self
                                          options:nil];
     }
     _url = url;
   }
   return self;
 }
 
-- (instancetype)init {
-  NOTREACHED();
-  return nil;
-}
-
 - (instancetype)initWithURL:(const GURL&)url {
   return [self initWithNibName:nil url:url];
 }
 
 - (void)dealloc {
   [_view removeFromSuperview];
-  [super dealloc];
 }
 
 #pragma mark CRWNativeContent
 
 - (void)handleLowMemory {
   // TODO(pinkerton): What should this do? Toss the view?
 }
 
 - (BOOL)isViewAlive {
   // TODO(pinkerton): See handleLowMemory above.
   return YES;
 }
 
 - (void)reload {
   // Not implemented in base class.
 }
 
 @end