[ios] Added deprecation comments and TODOs for ios/web classes/protocols

ios/web/public/web_state/crw_web_user_interface_delegate.h

 // 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.
 
 #ifndef IOS_WEB_PUBLIC_WEB_STATE_CRW_WEB_USER_INTERFACE_DELEGATE_H_
 #define IOS_WEB_PUBLIC_WEB_STATE_CRW_WEB_USER_INTERFACE_DELEGATE_H_
 
 #include <Foundation/Foundation.h>
 
 @class CRWWebController;
 class GURL;
 
+// DEPRECATED, do not conform to this protocol and do not add any methods to it.
+// Use web::WebStateDelegate instead.
+// TODO(crbug.com/675001): Remove this protocol.
 @protocol CRWWebUserInterfaceDelegate<NSObject>
 
  @optional
 // The JavaScript panel selectors below are only called by the web controller
 // for builds with WKWebView enabled.
 
 // Displays a JavaScript alert with an OK button, showing the provided message.
 // |completionHandler| is called after the OK button on the alert is tapped.
 // If this selector isn't implemented, the completion handler provided by the
 // web view will be called without any UI displayed. If this method is
@@ skipping 43 matching lines @@
                  proposedCredential:(NSURLCredential*)credential
                   completionHandler:
                       (void (^)(NSString* user, NSString* password))handler;
 
 // Cancels any outstanding dialogs requested by the methods above.
 - (void)cancelDialogsForWebController:(CRWWebController*)webController;
 
 @end
 
 #endif  // IOS_WEB_PUBLIC_WEB_STATE_CRW_WEB_USER_INTERFACE_DELEGATE_H_