Add HttpProtocolHandler and convert everything to use it

net/url_request/http_protocol_handler.cc

Index: net/url_request/http_protocol_handler.cc
diff --git a/net/url_request/http_protocol_handler.cc b/net/url_request/http_protocol_handler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c607232e6834f6e8ca35981d43da7d198cdf6b56
--- /dev/null
+++ b/net/url_request/http_protocol_handler.cc
@@ -0,0 +1,45 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/logging.h"
+#include "net/base/net_errors.h"
+#include "net/url_request/http_protocol_handler.h"
+#include "net/url_request/url_request.h"
+#include "net/url_request/url_request_context.h"
+#include "net/url_request/url_request_error_job.h"
+#include "net/url_request/url_request_http_job.h"
+#include "net/url_request/url_request_redirect_job.h"
+#include "url/gurl.h"
+#include "url/url_constants.h"
+
+namespace net {
+
+HttpProtocolHandler::HttpProtocolHandler() {}
+
+URLRequestJob* HttpProtocolHandler::MaybeCreateJob(
+    URLRequest* request,
+    NetworkDelegate* network_delegate) const {
+  DCHECK(request->url().scheme() == url::kHttpScheme ||
+         request->url().scheme() == url::kHttpsScheme ||
+         request->url().scheme() == url::kWsScheme ||
+         request->url().scheme() == url::kWssScheme);
+
+  if (!request->context()->http_transaction_factory()) {
+    NOTREACHED() << "requires a valid context";
+    return new URLRequestErrorJob(request, network_delegate,
+                                  ERR_INVALID_ARGUMENT);
+  }
+
+  GURL redirect_url;
+  if (request->GetHSTSRedirect(&redirect_url)) {
+    return new URLRequestRedirectJob(
+        request, network_delegate, redirect_url,
+        // Use status code 307 to preserve the method, so POST requests work.
+        URLRequestRedirectJob::REDIRECT_307_TEMPORARY_REDIRECT, "HSTS");
+  }
+  return new URLRequestHttpJob(request, network_delegate,
+                               request->context()->http_user_agent_settings());
+}
+
+}  // namespace net