Convert test_support source sets to static libs

components/data_reduction_proxy/core/common/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("//chrome/version.gni")
 
 # Variables:
 #   deps: Extra dependencies.
 template("common_tmpl") {
   source_set(target_name) {
@@ skipping 39 matching lines @@
   }
 }
 
 common_tmpl("common") {
   deps = [
     "//net",
     "//url",
   ]
 }
 
-source_set("test_support") {
+static_library("test_support") {
   testonly = true
   sources = [
     "data_reduction_proxy_event_storage_delegate_test_utils.cc",
     "data_reduction_proxy_event_storage_delegate_test_utils.h",
     "data_reduction_proxy_headers_test_utils.cc",
     "data_reduction_proxy_headers_test_utils.h",
     "data_reduction_proxy_params_test_utils.cc",
     "data_reduction_proxy_params_test_utils.h",
   ]
 
@@ skipping 35 matching lines @@
 }
 
 process_version("version_header") {
   template_file = "version.h.in"
   output = "$target_gen_dir/version.h"
   extra_args = [
     "-e",
     "VERSION_FULL=\"%s.%s.%s.%s\" % (MAJOR,MINOR,BUILD,PATCH)",
   ]
 }