win: Add implementation of HTTPTransport based on WinHTTP

util/util.gyp

Index: util/util.gyp
diff --git a/util/util.gyp b/util/util.gyp
index 86d13f77c87ee0c10d95f581e4c7b93f5ce863ca..2d3d848cb7752fb7f9b34b8b9705c4b8fb86a8a3 100644
--- a/util/util.gyp
+++ b/util/util.gyp
@@ -97,6 +97,7 @@
         'net/http_transport.cc',
         'net/http_transport.h',
         'net/http_transport_mac.mm',
+        'net/http_transport_win.cc',
         'numeric/checked_range.h',
         'numeric/in_range_cast.h',
         'numeric/int128.h',
@@ -186,6 +187,13 @@
             ],
           },
         }],
+        ['OS=="win"', {
+          'link_settings': {
+            'libraries': [
+              '-lwinhttp.lib',
+            ],
+          },
+        }],
       ],
     },
     {
@@ -301,12 +309,6 @@
             ],
           },
         }],
-        ['OS=="win"', {
-          'sources!': [
-            # TODO(scottmg): Temporarily excluded during Windows bring up.
-            'net/http_transport_test.cc',
-          ],
-        }],
       ],
     },
     {