Remove support for GlobalNetworkClientFactory from RequestTracker.

ios/net/crn_http_protocol_handler.mm

 // Copyright 2012 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/net/crn_http_protocol_handler.h"
 
 #include <stdint.h>
 
 #include <memory>
 #include <utility>
@@ skipping 645 matching lines @@
     // The request is associated with a tracker that does not exist, cancel it.
     // NSURLErrorCancelled avoids triggering any error page.
     [top_level_client_ didFailWithNSErrorCode:NSURLErrorCancelled
                                  netErrorCode:ERR_ABORTED];
     return;
   }
 
   if (tracker_) {
     // Set up any clients that can operate regardless of the request
     PushClients(tracker_->ClientsHandlingAnyRequest());
-  } else {
-    // There was no request_group_id, so the request was from something like a
-    // data: or file: URL.
-    // Attach any global clients to the request.
-    PushClients(RequestTracker::GlobalClientsHandlingAnyRequest());

[sdefresne, 2017/01/13 10:29:12]

This method was always returning an empty NSArray, so I just removed the call to
PushClients.

   }
 
   // Now that all of the network clients are set up, if there was an error with
   // the URL, it can be raised and all of the clients will have a chance to
   // handle it.
   if (!url.is_valid()) {
     DLOG(ERROR) << "Trying to load an invalid URL: "
                 << base::SysNSStringToUTF8([[request_ URL] absoluteString]);
     [top_level_client_ didFailWithNSErrorCode:NSURLErrorBadURL
                                  netErrorCode:ERR_INVALID_URL];
@@ skipping 342 matching lines @@
                  base::Bind(&net::HttpProtocolHandlerCore::Cancel, _core));
   [_protocolProxy invalidate];
 }
 
 - (void)stopLoading {
   [self cancelRequest];
   _protocolProxy.reset();
 }
 
 @end