Add HttpProtocolHandler and convert everything to use it

chrome/browser/io_thread.cc

Index: chrome/browser/io_thread.cc
diff --git a/chrome/browser/io_thread.cc b/chrome/browser/io_thread.cc
index 99a914c8229e65878c55c0d0a8716ddabe5f111d..66ace65e901bd2379937e09b45ea373ae78392bf 100644
--- a/chrome/browser/io_thread.cc
+++ b/chrome/browser/io_thread.cc
@@ -1660,8 +1660,8 @@ net::URLRequestContext* IOThread::ConstructSystemRequestContext(
       globals->http_auth_handler_factory.get());
   context->set_proxy_service(globals->system_proxy_service.get());
 
-  globals->system_url_request_job_factory.reset(
-      new net::URLRequestJobFactoryImpl());
+  globals->system_url_request_job_factory =
+      net::URLRequestJobFactoryImpl::CreateWithDefaultProtocolHandlers();
   context->set_job_factory(globals->system_url_request_job_factory.get());
 
   context->set_cookie_store(globals->system_cookie_store.get());
@@ -1748,8 +1748,8 @@ net::URLRequestContext* IOThread::ConstructProxyScriptFetcherContext(
   context->set_http_transaction_factory(
       globals->proxy_script_fetcher_http_transaction_factory.get());
 
-  std::unique_ptr<net::URLRequestJobFactoryImpl> job_factory(
-      new net::URLRequestJobFactoryImpl());
+  std::unique_ptr<net::URLRequestJobFactoryImpl> job_factory =
+      net::URLRequestJobFactoryImpl::CreateWithDefaultProtocolHandlers();
 
   job_factory->SetProtocolHandler(
       url::kDataScheme, base::WrapUnique(new net::DataProtocolHandler()));