Remove isolated app code from iOS's chrome_browser_state_io_data.

ios/chrome/browser/browser_state/off_the_record_chrome_browser_state_io_data.mm

Index: ios/chrome/browser/browser_state/off_the_record_chrome_browser_state_io_data.mm
diff --git a/ios/chrome/browser/browser_state/off_the_record_chrome_browser_state_io_data.mm b/ios/chrome/browser/browser_state/off_the_record_chrome_browser_state_io_data.mm
index b420e0e83bb73a3ab1b6503a85a74a55c62dd432..f1f9b03627d0b5ca25fdcb92b31e20860d40cf99 100644
--- a/ios/chrome/browser/browser_state/off_the_record_chrome_browser_state_io_data.mm
+++ b/ios/chrome/browser/browser_state/off_the_record_chrome_browser_state_io_data.mm
@@ -223,17 +223,3 @@ void OffTheRecordChromeBrowserStateIOData::InitializeInternal(
   sdch_policy_.reset(new net::SdchOwner(sdch_manager_.get(), main_context));
   main_context->set_sdch_manager(sdch_manager_.get());
 }
-
-net::URLRequestContext*
-OffTheRecordChromeBrowserStateIOData::InitializeAppRequestContext(
-    net::URLRequestContext* main_context) const {
-  NOTREACHED();
-  return nullptr;
-}
-
-net::URLRequestContext*
-OffTheRecordChromeBrowserStateIOData::AcquireIsolatedAppRequestContext(
-    net::URLRequestContext* main_context) const {
-  NOTREACHED();
-  return nullptr;
-}