Remove isolated app code from iOS's chrome_browser_state_io_data.

ios/chrome/browser/net/ios_chrome_url_request_context_getter.h

 // 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.
 
 #ifndef IOS_CHROME_BROWSER_NET_IOS_CHROME_URL_REQUEST_CONTEXT_GETTER_H_
 #define IOS_CHROME_BROWSER_NET_IOS_CHROME_URL_REQUEST_CONTEXT_GETTER_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "ios/chrome/browser/net/net_types.h"
@@ skipping 24 matching lines @@
   net::URLRequestContext* GetURLRequestContext() override;
   scoped_refptr<base::SingleThreadTaskRunner> GetNetworkTaskRunner()
       const override;
 
   // Create an instance for use with an 'original' (non-OTR) profile. This is
   // expected to get called on the UI thread.
   static IOSChromeURLRequestContextGetter* Create(
       const ChromeBrowserStateIOData* io_data,
       ProtocolHandlerMap* protocol_handlers);
 
-  // Create an instance for an original profile for an app with isolated
-  // storage. This is expected to get called on UI thread.
-  static IOSChromeURLRequestContextGetter* CreateForIsolatedApp(
-      net::URLRequestContextGetter* main_context,
-      const ChromeBrowserStateIOData* io_data,
-      const base::FilePath& partition_path);
-
   // Discard reference to URLRequestContext and inform observers of shutdown.
   // Must be called before destruction. May only be called on IO thread.
   void NotifyContextShuttingDown();
 
  private:
   ~IOSChromeURLRequestContextGetter() override;
 
   // Deferred logic for creating a URLRequestContext.
   // Access only from the IO thread.
   scoped_ptr<IOSChromeURLRequestContextFactory> factory_;
 
   // NULL before initialization and after invalidation.
   // Otherwise, it is the URLRequestContext instance that
   // was lazily created by GetURLRequestContext().
   // Access only from the IO thread.
   net::URLRequestContext* url_request_context_;
 
   DISALLOW_COPY_AND_ASSIGN(IOSChromeURLRequestContextGetter);
 };
 
 #endif  // IOS_CHROME_BROWSER_NET_IOS_CHROME_URL_REQUEST_CONTEXT_GETTER_H_