Add HttpProtocolHandler and convert everything to use it

net/url_request/url_request_http_job.h

Index: net/url_request/url_request_http_job.h
diff --git a/net/url_request/url_request_http_job.h b/net/url_request/url_request_http_job.h
index a15604f6b88e31ecb06e2a1555410a12c9cf194c..b061cde803e0ba7bbbb3b40bd6adfb485810e504 100644
--- a/net/url_request/url_request_http_job.h
+++ b/net/url_request/url_request_http_job.h
@@ -45,15 +45,14 @@ class URLRequestContext;
 // provides an implementation for both HTTP and HTTPS.
 class NET_EXPORT_PRIVATE URLRequestHttpJob : public URLRequestJob {
  public:
-  static URLRequestJob* Factory(URLRequest* request,
-                                NetworkDelegate* network_delegate,
-                                const std::string& scheme);
-
- protected:
+  // Creates a URLRequestHttpJob. Non-test code other than HttpProtocolHandler
+  // shouldn't use this constructor directly, because HttpProtocolHandler is
+  // where HSTS redirects happen.
   URLRequestHttpJob(URLRequest* request,
                     NetworkDelegate* network_delegate,
                     const HttpUserAgentSettings* http_user_agent_settings);
 
+ protected:
   ~URLRequestHttpJob() override;
 
   // Overridden from URLRequestJob: