Convert some GN test support targets to static libs.

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/buildflag_header.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
@@ skipping 488 matching lines @@
 bundle_data("test_support_bundle_data") {
   visibility = [ ":test_support" ]
   testonly = true
   sources = gypi_values.net_test_support_data_sources
   outputs = [
     "{{bundle_resources_dir}}/" +
         "{{source_root_relative_dir}}/{{source_file_part}}",
   ]
 }
 
-source_set("test_support") {
+static_library("test_support") {
   testonly = true
   sources = [
     "base/load_timing_info_test_util.cc",
     "base/load_timing_info_test_util.h",
     "base/mock_file_stream.cc",
     "base/mock_file_stream.h",
     "base/test_completion_callback.cc",
     "base/test_completion_callback.h",
     "cert/mock_cert_verifier.cc",
     "cert/mock_cert_verifier.h",
@@ skipping 1222 matching lines @@
     if (use_v8_in_net) {
       deps += [ ":net_with_v8" ]
     } else {
       sources -= [ "proxy/proxy_resolver_perftest.cc" ]
     }
   }
 }
 
 # Fuzzers
 
-source_set("net_fuzzer_test_support") {
+static_library("net_fuzzer_test_support") {
   testonly = true
 
   sources = [
     "base/fuzzed_data_provider.cc",
     "base/fuzzed_data_provider.h",
     "base/fuzzer_test_support.cc",
     "socket/fuzzed_socket.cc",
     "socket/fuzzed_socket.h",
     "socket/fuzzed_socket_factory.cc",
     "socket/fuzzed_socket_factory.h",
@@ skipping 318 matching lines @@
     "url_request/url_request_fuzzer.cc",
   ]
   deps = [
     ":net_fuzzer_test_support",
     ":test_support",
     "//base",
     "//net",
   ]
   dict = "data/fuzzer_dictionaries/net_url_request_fuzzer.dict"
 }