[ios] Moved WebUI provider code to ios/web.

ios/public/provider/web/web_ui_ios.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_PUBLIC_PROVIDER_WEB_WEB_UI_IOS_H_
 #define IOS_PUBLIC_PROVIDER_WEB_WEB_UI_IOS_H_
 
-#include <vector>
-
-#include "base/callback.h"
-#include "base/strings/string16.h"
-
-class GURL;
-
-namespace base {
-class ListValue;
-class Value;
-}
-
-namespace web {
-
-class WebState;
-class WebUIIOSController;
-class WebUIIOSMessageHandler;
-
-// A WebUIIOS sets up the datasources and message handlers for a given
-// HTML-based UI.
-class WebUIIOS {
- public:
-  // Returns JavaScript code that, when executed, calls the function specified
-  // by |function_name| with the arguments specified in |arg_list|.
-  static base::string16 GetJavascriptCall(
-      const std::string& function_name,
-      const std::vector<const base::Value*>& arg_list);
-
-  virtual ~WebUIIOS() {}
-
-  virtual web::WebState* GetWebState() const = 0;
-
-  virtual WebUIIOSController* GetController() const = 0;
-  virtual void SetController(WebUIIOSController* controller) = 0;
-
-  // Takes ownership of |handler|, which will be destroyed when the WebUIIOS is.
-  virtual void AddMessageHandler(WebUIIOSMessageHandler* handler) = 0;
-
-  // Used by WebUIIOSMessageHandlers. If the given message is already
-  // registered, the call has no effect unless |register_callback_overwrites_|
-  // is set to true.
-  typedef base::Callback<void(const base::ListValue*)> MessageCallback;
-  virtual void RegisterMessageCallback(const std::string& message,
-                                       const MessageCallback& callback) = 0;
-
-  // This is only needed if an embedder overrides handling of a WebUIIOSMessage
-  // and then later wants to undo that, or to route it to a different WebUIIOS
-  // object.
-  virtual void ProcessWebUIIOSMessage(const GURL& source_url,
-                                      const std::string& message,
-                                      const base::ListValue& args) = 0;
-
-  // Call a Javascript function.  This is asynchronous; there's no way to get
-  // the result of the call, and should be thought of more like sending a
-  // message to the page.  All function names in WebUI must consist of only
-  // ASCII characters.  There are variants for calls with more arguments.
-  virtual void CallJavascriptFunction(const std::string& function_name) = 0;
-  virtual void CallJavascriptFunction(const std::string& function_name,
-                                      const base::Value& arg) = 0;
-  virtual void CallJavascriptFunction(const std::string& function_name,
-                                      const base::Value& arg1,
-                                      const base::Value& arg2) = 0;
-  virtual void CallJavascriptFunction(const std::string& function_name,
-                                      const base::Value& arg1,
-                                      const base::Value& arg2,
-                                      const base::Value& arg3) = 0;
-  virtual void CallJavascriptFunction(const std::string& function_name,
-                                      const base::Value& arg1,
-                                      const base::Value& arg2,
-                                      const base::Value& arg3,
-                                      const base::Value& arg4) = 0;
-  virtual void CallJavascriptFunction(
-      const std::string& function_name,
-      const std::vector<const base::Value*>& args) = 0;
-};
-
-}  // namespace web
+// TODO(crbug.com/524467): Remove this file once downstream code is switched to
+// use correct header.
+#include "ios/web/public/webui/web_ui_ios.h"
 
 #endif  // IOS_PUBLIC_PROVIDER_WEB_WEB_UI_IOS_H_