Fix shadowed variables in the content layer.

Shadowed variables can make code harder to read. Don't support them
in the content layer.

BUG=794619

This CL was uploaded by git cl split.

R=kinuko@chromium.org

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: I496a5dbfd270826969deea1edb01dd572dff2d99
Reviewed-on: https://chromium-review.googlesource.com/923353Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537665}

services/network/resource_scheduler.cc

@@ -1095,9 +1095,9 @@ void ResourceScheduler::OnClientDeleted(int child_id, int route_id) {
   // navigations, async revalidations and detachable requests after
   // OnClientDeleted() returns.
   RequestSet client_unowned_requests = client->StartAndRemoveAllRequests();
-  for (RequestSet::iterator it = client_unowned_requests.begin();
-       it != client_unowned_requests.end(); ++it) {
-    unowned_requests_.insert(*it);
+  for (RequestSet::iterator request_it = client_unowned_requests.begin();
+       request_it != client_unowned_requests.end(); ++request_it) {
+    unowned_requests_.insert(*request_it);
   }
 
   delete client;