[ios] Do not use private web// API in ios_web_shell.

ios/web/public/web_state/web_state.h

 // Copyright 2013 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_WEB_STATE_H_
 #define IOS_WEB_PUBLIC_WEB_STATE_WEB_STATE_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 30 matching lines @@
 class NavigationManager;
 class WebInterstitial;
 class WebStateDelegate;
 class WebStateObserver;
 class WebStatePolicyDecider;
 class WebStateWeakPtrFactory;
 
 // Core interface for interaction with the web.
 class WebState : public base::SupportsUserData {
  public:
+  // Parameters for the Create() method.
+  struct CreateParams {
+    explicit CreateParams(web::BrowserState* browser_state);
+    ~CreateParams();
+
+    web::BrowserState* browser_state;
+  };
+
   // Parameters for the OpenURL() method.
   struct OpenURLParams {
     OpenURLParams(const GURL& url,
                   const Referrer& referrer,
                   WindowOpenDisposition disposition,
                   ui::PageTransition transition,
                   bool is_renderer_initiated);
     ~OpenURLParams();
 
     // The URL/referrer to be opened.
@@ skipping 16 matching lines @@
       int, /* HTTP status code */
       const GURL&, /* image_url */
       const std::vector<SkBitmap>&, /* bitmaps */
       /* The sizes in pixel of the bitmaps before they were resized due to the
          max bitmap size passed to DownloadImage(). Each entry in the bitmaps
          vector corresponds to an entry in the sizes vector. If a bitmap was
          resized, there should be a single returned bitmap. */
       const std::vector<gfx::Size>&)>
           ImageDownloadCallback;
 
+  // Creates a new WebState.
+  static std::unique_ptr<WebState> Create(const CreateParams& params);
+
   ~WebState() override {}
 
   // Gets/Sets the delegate.
   virtual WebStateDelegate* GetDelegate() = 0;
   virtual void SetDelegate(WebStateDelegate* delegate) = 0;
 
   // Whether or not a web view is allowed to exist in this WebState. Defaults
   // to false; this should be enabled before attempting to access the view.
   virtual bool IsWebUsageEnabled() const = 0;
   virtual void SetWebUsageEnabled(bool enabled) = 0;
@@ skipping 143 matching lines @@
 
   // Returns a WeakPtr<WebState> to the current WebState. Must remain private
   // and only call must be in WebStateWeakPtrFactory. Please consult that class
   // for more details. Remove as part of http://crbug.com/556736.
   virtual base::WeakPtr<WebState> AsWeakPtr() = 0;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_WEB_STATE_WEB_STATE_H_