net: Stop using base::WorkerPool from UploadFileElementReader

net/url_request/url_request_unittest.cc

Index: net/url_request/url_request_unittest.cc
diff --git a/net/url_request/url_request_unittest.cc b/net/url_request/url_request_unittest.cc
index bd21b38eb6ed1f4a824f5c28d41f5c67959d6ef3..75456ed282c15df43a150746aeaddade7783ed91 100644
--- a/net/url_request/url_request_unittest.cc
+++ b/net/url_request/url_request_unittest.cc
@@ -3157,10 +3157,11 @@ TEST_F(URLRequestTestHTTP, PostFileTest) {
     path = path.Append(FILE_PATH_LITERAL("url_request_unittest"));
     path = path.Append(FILE_PATH_LITERAL("with-headers.html"));
     element_readers.push_back(new UploadFileElementReader(
-        path, 0, kuint64max, base::Time()));
+        base::MessageLoopProxy::current(), path, 0, kuint64max, base::Time()));
 
     // This file should just be ignored in the upload stream.
     element_readers.push_back(new UploadFileElementReader(
+        base::MessageLoopProxy::current(),
         FilePath(FILE_PATH_LITERAL(
             "c:\\path\\to\\non\\existant\\file.randomness.12345")),
         0, kuint64max, base::Time()));