Remove support for custom NSURLProtocol.

ios/chrome/app/main_controller.mm

Index: ios/chrome/app/main_controller.mm
diff --git a/ios/chrome/app/main_controller.mm b/ios/chrome/app/main_controller.mm
index 5b0bda09a17730b19e62b5552f753b6068b4681e..830b78049d6e112b52b1672df373bf3b4147e407 100644
--- a/ios/chrome/app/main_controller.mm
+++ b/ios/chrome/app/main_controller.mm
@@ -127,7 +127,6 @@
 #include "ios/chrome/browser/xcallback_parameters.h"
 #include "ios/chrome/grit/ios_strings.h"
 #include "ios/net/cookies/cookie_store_ios.h"
-#import "ios/net/crn_http_protocol_handler.h"
 #include "ios/public/provider/chrome/browser/chrome_browser_provider.h"
 #include "ios/public/provider/chrome/browser/distribution/app_distribution_provider.h"
 #import "ios/public/provider/chrome/browser/native_app_launcher/native_app_whitelist_manager.h"
@@ -137,7 +136,6 @@
 #import "ios/third_party/material_roboto_font_loader_ios/src/src/MaterialRobotoFontLoader.h"
 #include "ios/web/net/request_tracker_factory_impl.h"
 #include "ios/web/net/request_tracker_impl.h"
-#include "ios/web/net/web_http_protocol_handler_delegate.h"
 #import "ios/web/public/navigation_manager.h"
 #include "ios/web/public/web_capabilities.h"
 #include "ios/web/public/web_state/web_state.h"
@@ -317,10 +315,6 @@ enum class StackViewDismissalMode { NONE, NORMAL, INCOGNITO };
   // RequestTrackerFactory to customize the behavior of the network stack.
   std::unique_ptr<web::RequestTrackerFactoryImpl> _requestTrackerFactory;
 
-  // Configuration for the HTTP protocol handler.
-  std::unique_ptr<web::WebHTTPProtocolHandlerDelegate>
-      _httpProtocolHandlerDelegate;
-
   // True if First Run UI (terms of service & sync sign-in) is being presented
   // in a modal dialog.
   BOOL _isPresentingFirstRunUI;
@@ -571,7 +565,6 @@ enum class StackViewDismissalMode { NONE, NORMAL, INCOGNITO };
 
 - (void)dealloc {
   [[NSNotificationCenter defaultCenter] removeObserver:self];
-  net::HTTPProtocolHandlerDelegate::SetInstance(nullptr);
   net::RequestTracker::SetRequestTrackerFactory(nullptr);
   [NSObject cancelPreviousPerformRequestsWithTarget:self];
   [super dealloc];
@@ -647,8 +640,7 @@ enum class StackViewDismissalMode { NONE, NORMAL, INCOGNITO };
   // TODO(crbug.com/546171): Audit all the following code to see if some of it
   // should move into BrowserMainParts or BrowserProcess.
 
-  [NetworkStackSetup setUpChromeNetworkStack:&_requestTrackerFactory
-                 httpProtocolHandlerDelegate:&_httpProtocolHandlerDelegate];
+  _requestTrackerFactory = [NetworkStackSetup setUpChromeNetworkStack];
 }
 
 - (void)startUpBrowserForegroundInitialization {