DevTools: check Host header for being IP or localhost when connecting over RDP.

Bug: 813540
Change-Id: I9338aa2475c15090b8a60729be25502eb866efb7
Reviewed-on: https://chromium-review.googlesource.com/952522
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Pavel Feldman <pfeldman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541547}
void DevToolsHttpHandler::OnDiscoveryPageRequest(int connection_id) {
  std::string response = delegate_->GetDiscoveryPageHTML();
  Send200(connection_id, response, "text/html; charset=UTF-8");
}

void DevToolsHttpHandler::OnDiscoveryPageRequest(int connection_id) {
  std::string response = delegate_->GetDiscoveryPageHTML();
  Send200(connection_id, response, "text/html; charset=UTF-8");
}
