Remove isolated app code from iOS's chrome_browser_state_io_data.

ios/chrome/browser/browser_state/chrome_browser_state_impl.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_CHROME_BROWSER_STATE_IMPL_
 #define IOS_CHROME_BROWSER_BROWSER_STATE_CHROME_BROWSER_STATE_IMPL_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
@@ skipping 27 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;
 
   // BrowserState:
   bool IsOffTheRecord() const override;
   base::FilePath GetStatePath() const override;
 
  private:
   friend class ChromeBrowserStateManagerImpl;
 
   explicit ChromeBrowserStateImpl(const base::FilePath& path);
 
@@ skipping 37 matching lines @@
   // and you can read the raw headers here:
   //
   // components/keyed_service/ios/browser_state_dependency_manager.*
   // components/keyed_service/core/keyed_service.h
   // components/keyed_service/ios/browser_state_keyed_service_factory.*
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserStateImpl);
 };
 
 #endif  // IOS_CHROME_BROWSER_BROWSER_STATE_CHROME_BROWSER_STATE_IMPL_