Address more TOOD(GYP) in GN build.

sync/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//sync/protocol/protocol_sources.gni")
 import("//testing/test.gni")
 
 component("sync") {
   public_deps = [
@@ skipping 783 matching lines @@
   ]
 
   configs += [ "//build/config/compiler:wexit_time_destructors" ]
 
   public_deps = [
     "//base",
     "//net:test_support",
   ]
   deps = [
     ":sync",
+
     # The sync test server uses Python modules generated by the sync protos.
-    #  '../third_party/protobuf/protobuf.gyp:py_proto',  # TODO(GYP)
+    "//third_party/protobuf:py_proto",
   ]
 }
 
 if (!is_ios) {
   # GYP version: sync/sync_tests.gypi:run_sync_testserver
   executable("run_sync_testserver") {
     testonly = true
     sources = [
       "tools/testserver/run_sync_testserver.cc",
     ]
@@ skipping 74 matching lines @@
       ":fake_server_jni",
       ":sync_core",
       ":test_support_sync_fake_server",
       "//base",
       "//sync/protocol:protocol",
       "//testing/gtest",
       "//url:url",
     ]
   }
 }