Remove isolated app code from iOS's chrome_browser_state_io_data.

ios/chrome/browser/browser_state/test_chrome_browser_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_CHROME_BROWSER_BROWSER_STATE_TEST_CHROME_BROWSER_STATE_H_
 #define IOS_CHROME_BROWSER_BROWSER_STATE_TEST_CHROME_BROWSER_STATE_H_
 
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
@@ skipping 35 matching lines @@
   PrefProxyConfigTracker* GetProxyConfigTracker() override;
   net::SSLConfigService* GetSSLConfigService() override;
   PrefService* GetPrefs() override;
   PrefService* GetOffTheRecordPrefs() override;
   ChromeBrowserStateIOData* GetIOData() override;
   void ClearNetworkingHistorySince(base::Time time,
                                    const base::Closure& completion) override;
   net::URLRequestContextGetter* CreateRequestContext(
       ProtocolHandlerMap* protocol_handlers,
       URLRequestInterceptorScopedVector request_interceptors) override;
-  net::URLRequestContextGetter* CreateIsolatedRequestContext(
-      const base::FilePath& partition_path) override;
   TestChromeBrowserState* AsTestChromeBrowserState() override;
 
   // This method is defined as empty following the paradigm of
   // TestingProfile::DestroyOffTheRecordProfile().
   void DestroyOffTheRecordChromeBrowserState() override {}
 
   // Creates a WebDataService. If not invoked, the web data service is null.
   void CreateWebDataService();
 
   // Creates the BookmkarBarModel. If not invoked the bookmark bar model is
@@ skipping 95 matching lines @@
 
   // The incognito ChromeBrowserState instance that is associated with this
   // non-incognito ChromeBrowserState instance.
   scoped_ptr<TestChromeBrowserState> otr_browser_state_;
   TestChromeBrowserState* original_browser_state_;
 
   DISALLOW_COPY_AND_ASSIGN(TestChromeBrowserState);
 };
 
 #endif  // IOS_CHROME_BROWSER_BROWSER_STATE_TEST_CHROME_BROWSER_STATE_H_