Add HttpProtocolHandler and convert everything to use it

net/proxy/proxy_script_fetcher_impl_unittest.cc

Index: net/proxy/proxy_script_fetcher_impl_unittest.cc
diff --git a/net/proxy/proxy_script_fetcher_impl_unittest.cc b/net/proxy/proxy_script_fetcher_impl_unittest.cc
index 9154798ad73795aec10591d8dd339240a4cc4cea..288282b71adbf336adfe3c0b8aa8e4338d3e8ff2 100644
--- a/net/proxy/proxy_script_fetcher_impl_unittest.cc
+++ b/net/proxy/proxy_script_fetcher_impl_unittest.cc
@@ -86,7 +86,8 @@ class RequestContext : public URLRequestContext {
         new HttpCache(storage_.http_network_session(),
                       HttpCache::DefaultBackend::InMemory(0), false)));
     std::unique_ptr<URLRequestJobFactoryImpl> job_factory =
-        base::WrapUnique(new URLRequestJobFactoryImpl());
+        URLRequestJobFactoryImpl::CreateWithHttpProtocolHandlers();
+
 #if !defined(DISABLE_FILE_SUPPORT)
     job_factory->SetProtocolHandler("file",
                                     base::WrapUnique(new FileProtocolHandler(