Remove crufty bridge code from old CRD iOS app.

remoting/client/ios/bridge/client_proxy_delegate_wrapper.mm

-// Copyright 2016 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.
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-#import "remoting/client/ios/bridge/client_proxy_delegate_wrapper.h"
-
-@interface ClientProxyDelegateWrapper (Private)
-- (id)initWithDelegate:(id<ClientProxyDelegate>)delegate;
-@end
-
-@implementation ClientProxyDelegateWrapper
-
-@synthesize delegate = _delegate;
-
-- (id)initWithDelegate:(id<ClientProxyDelegate>)delegate {
-  self = [super init];
-  if (self) {
-    _delegate = delegate;
-  }
-  return self;
-}
-
-+ (id)wrapDelegate:(id<ClientProxyDelegate>)delegate {
-  return [[ClientProxyDelegateWrapper alloc] initWithDelegate:delegate];
-}
-
-@end