When turning a download into a navigation, navigate the right frame

Code changes from Nate Chapin <japhet@chromium.org>

Bug: 926105
Change-Id: I098599394e6ebe7d2fce5af838014297a337d294
Reviewed-on: https://chromium-review.googlesource.com/c/1454962
Reviewed-by: Camille Lamy <clamy@chromium.org>
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629547}
void ResourceDispatcherHostImpl::RemovePendingRequest(int child_id,
                                                      int request_id) {
  auto i = pending_loaders_.find(GlobalRequestID(child_id, request_id));
  if (i == pending_loaders_.end()) {
    NOTREACHED() << "Trying to remove a request that's not here";
    return;
  }
  RemovePendingLoader(i);
}

void ResourceDispatcherHostImpl::RemovePendingRequest(int child_id,
                                                      int request_id) {
  auto i = pending_loaders_.find(GlobalRequestID(child_id, request_id));
  if (i == pending_loaders_.end()) {
    NOTREACHED() << "Trying to remove a request that's not here";
    return;
  }
  RemovePendingLoader(i);
}
