[iOS/ARC] Fix a violation of ODR in base::BindBlock under ARC.

ios/web/net/clients/crw_redirect_network_client.mm

 // Copyright 2015 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 "ios/web/net/clients/crw_redirect_network_client.h"
 
 #include "base/location.h"
 #include "base/mac/bind_objc_block.h"
 #include "ios/web/public/web_thread.h"
 
@@ skipping 20 matching lines @@
 
 - (instancetype)init {
   NOTREACHED();
   return nil;
 }
 
 - (void)wasRedirectedToRequest:(NSURLRequest*)request
                  nativeRequest:(net::URLRequest*)nativeRequest
               redirectResponse:(NSURLResponse*)redirectResponse {
   DCHECK_CURRENTLY_ON(web::WebThread::IO);
-  web::WebThread::PostTask(web::WebThread::UI, FROM_HERE, base::BindBlock(^{
+  web::WebThread::PostTask(web::WebThread::UI, FROM_HERE, base::BindBlockArc(^{
                              [_delegate
                                  wasRedirectedToRequest:request
                                        redirectResponse:redirectResponse];
                            }));
   [super wasRedirectedToRequest:request
                   nativeRequest:nativeRequest
                redirectResponse:redirectResponse];
 }
 
 @end