[ios] Removed network stack related code from ios_web_shell's VC.

ios/web/shell/view_controller.mm

 // Copyright 2014 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.
 
 #import "ios/web/shell/view_controller.h"
 
 #import <MobileCoreServices/MobileCoreServices.h>
 
 #include <stdint.h>
 
 #include <memory>
 #include <utility>
 
 #import "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
-#import "ios/net/crn_http_protocol_handler.h"
-#import "ios/net/empty_nsurlcache.h"
-#import "ios/net/request_tracker.h"
 #import "ios/web/public/navigation_manager.h"
 #include "ios/web/public/referrer.h"
 #import "ios/web/public/web_state/context_menu_params.h"
 #import "ios/web/public/web_state/web_state.h"
 #import "ios/web/public/web_state/web_state_delegate_bridge.h"
 #import "ios/web/public/web_state/web_state_observer_bridge.h"
 #import "net/base/mac/url_conversions.h"
 #include "ui/base/page_transition_types.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
@@ skipping 26 matching lines @@
 @synthesize toolbarView = _toolbarView;
 
 - (instancetype)initWithBrowserState:(web::BrowserState*)browserState {
   self = [super initWithNibName:nil bundle:nil];
   if (self) {
     _browserState = browserState;
   }
   return self;
 }
 
-- (void)dealloc {
-  net::HTTPProtocolHandlerDelegate::SetInstance(nullptr);
-  net::RequestTracker::SetRequestTrackerFactory(nullptr);
-}
-
 - (void)viewDidLoad {
   [super viewDidLoad];
 
   CGRect bounds = self.view.bounds;
 
   // Set up the toolbar.
   _toolbarView = [[UIToolbar alloc] init];
   _toolbarView.barTintColor =
       [UIColor colorWithRed:0.337 green:0.467 blue:0.988 alpha:1.0];
   _toolbarView.frame = CGRectMake(0, 20, CGRectGetWidth(bounds), 44);
@@ skipping 45 matching lines @@
   [field setKeyboardType:UIKeyboardTypeWebSearch];
   [field setAutocorrectionType:UITextAutocorrectionTypeNo];
   [field setAccessibilityLabel:kWebShellAddressFieldAccessibilityLabel];
   [field setClearButtonMode:UITextFieldViewModeWhileEditing];
   self.field = field;
 
   [_toolbarView addSubview:back];
   [_toolbarView addSubview:forward];
   [_toolbarView addSubview:field];
 
-  // Set up the network stack before creating the WebState.
-  [self setUpNetworkStack];
-
   web::WebState::CreateParams webStateCreateParams(_browserState);
   _webState = web::WebState::Create(webStateCreateParams);
   _webState->SetWebUsageEnabled(true);
 
   _webStateObserver.reset(
       new web::WebStateObserverBridge(_webState.get(), self));
   _webStateDelegate.reset(new web::WebStateDelegateBridge(self));
   _webState->SetDelegate(_webStateDelegate.get());
 
   UIView* view = _webState->GetView();
   [view setFrame:[_containerView bounds]];
   [_containerView addSubview:view];
 
   NavigationManager::WebLoadParams params(GURL("https://dev.chromium.org/"));
   params.transition_type = ui::PAGE_TRANSITION_TYPED;
   self.navigationManager->LoadURLWithParams(params);
 }
 
 - (NavigationManager*)navigationManager {
   return _webState->GetNavigationManager();
 }
 
 - (web::WebState*)webState {
   return _webState.get();
 }
 
-- (void)setUpNetworkStack {
-  // Disable the default cache.
-  [NSURLCache setSharedURLCache:[EmptyNSURLCache emptyNSURLCache]];
-}
-
 - (void)didReceiveMemoryWarning {
   [super didReceiveMemoryWarning];
 }
 
 - (UIBarPosition)positionForBar:(id<UIBarPositioning>)bar {
   if (bar == _toolbarView) {
     return UIBarPositionTopAttached;
   }
   return UIBarPositionAny;
 }
@@ skipping 139 matching lines @@
   [alert addAction:[UIAlertAction actionWithTitle:@"Cancel"
                                             style:UIAlertActionStyleCancel
                                           handler:nil]];
 
   [self presentViewController:alert animated:YES completion:nil];
 
   return YES;
 }
 
 @end