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 DownloadResourceHandler::OnResponseStarted(
    network::ResourceResponse* response,
    std::unique_ptr<ResourceController> controller) {
  if (core_.OnResponseStarted(response->head.mime_type)) {
    controller->Resume();
  } else {
    controller->Cancel();
  }
}

void DownloadResourceHandler::OnResponseStarted(
    network::ResourceResponse* response,
    std::unique_ptr<ResourceController> controller) {
  if (core_.OnResponseStarted(response->head.mime_type)) {
    controller->Resume();
  } else {
    controller->Cancel();
  }
}
