Fix the following browser_tests in the Linux GN build.

net/BUILD.gn

 # Copyright (c) 2013 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/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/module_args/v8.gni")
 import("//url/config.gni")
 import("//testing/test.gni")
@@ skipping 685 matching lines @@
     "//base",
     "//base/test:test_support",
     "//crypto",
     "//net",
     "//net/tools/tld_cleanup",
     "//testing/gmock",
     "//testing/gtest",
     "//url",
   ]
 
+  if (!is_ios) {
+    public_deps += [ "//third_party/protobuf:py_proto" ]
+  }
+
   if (!use_openssl && (use_nss_certs || is_ios)) {
     public_deps += [ "//crypto:platform" ]
   }
 
   if (!is_android) {
     sources -= [
       "test/spawned_test_server/remote_test_server.cc",
       "test/spawned_test_server/remote_test_server.h",
       "test/spawned_test_server/spawner_communicator.cc",
       "test/spawned_test_server/spawner_communicator.h",
@@ skipping 219 matching lines @@
   }
 
   executable("run_testserver") {
     testonly = true
     sources = [
       "tools/testserver/run_testserver.cc",
     ]
     deps = [
       ":net",  # TODO(brettw) bug 363749: this shouldn't be necessary. It's not
                # in the GYP build, and can be removed when the bug is fixed.
-
       ":test_support",
       "//base",
       "//base/test:test_support",
       "//testing/gtest",
     ]
   }
 
   executable("stress_cache") {
     testonly = true
     sources = [
@@ skipping 537 matching lines @@
       "quic/quic_server_bin.cc",
     ]
     deps = [
       ":quic_tools",
       ":net",
       "//base",
       "//third_party/boringssl",
     ]
   }
 }  # !is_android && !is_win && !is_mac