Remove obsolete RequestTrackerImpl::CancelRequests.

ios/web/net/request_tracker_impl.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/net/request_tracker_impl.h"
 
 #include <pthread.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 387 matching lines @@
 void RequestTrackerImpl::Close() {
   DCHECK_CURRENTLY_ON(web::WebThread::UI);
   // Mark the tracker as closing on the IO thread. Note that because the local
   // scoped_refptr here retains |this|, we a are guaranteed that destruiction
   // won't begin until the block completes, and thus |is_closing_| will always
   // be set before destruction begins.
   web::WebThread::PostTask(web::WebThread::IO, FROM_HERE,
                            base::Bind(
                                [](RequestTrackerImpl* tracker) {
                                  tracker->is_closing_ = true;
-                                 tracker->CancelRequests();
                                },
                                base::RetainedRef(this)));
 
   // Disable the delegate.
   delegate_ = nil;
   // The user_info is no longer needed.
   user_info_.reset();
 }
 
 // static
@@ skipping 814 matching lines @@
   NSMutableArray* urls = [NSMutableArray array];
   for (const auto& tracker_count : counts_)
     [urls addObject:tracker_count->Description()];
 
   return [NSString stringWithFormat:@"RequestGroupID %@\n%@\n%@",
                                     request_group_id_.get(),
                                     net::NSURLWithGURL(page_url_),
                                     [urls componentsJoinedByString:@"\n"]];
 }
 
-void RequestTrackerImpl::CancelRequests() {
-  DCHECK_CURRENTLY_ON(web::WebThread::IO);
-  std::set<net::URLRequest*>::iterator it;
-  // TODO(droger): When canceling the request, we should in theory make sure
-  // that the NSURLProtocol client method |didFailWithError| is called,
-  // otherwise the iOS system may wait indefinitely for the request to complete.
-  // However, as we currently only cancel the requests when closing a tab, the
-  // requests are all canceled by the system shortly after and nothing bad
-  // happens.
-  for (it = live_requests_.begin(); it != live_requests_.end(); ++it)
-    (*it)->Cancel();
-
-  live_requests_.clear();
-}
-
 void RequestTrackerImpl::SetCertificatePolicyCacheForTest(
     web::CertificatePolicyCache* cache) {
   policy_cache_ = cache;
 }
 
 }  // namespace web