Convert test_support source sets to static libs

chrome/renderer/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("//tools/grit/grit_rule.gni")
 
 gypi_values = exec_script("//build/gypi_to_gn.py",
                           [ rebase_path("../chrome_renderer.gypi") ],
                           "scope",
@@ skipping 169 matching lines @@
   }
   if (is_android) {
     sources -= [
       "spellchecker/hunspell_engine.cc",
       "spellchecker/hunspell_engine.h",
     ]
   }
 }
 
 # In GYP this is part of test_support_common.
-source_set("test_support") {
+static_library("test_support") {
   testonly = true
   visibility = [ "//chrome/test:test_support" ]
 
   sources = [
     "chrome_mock_render_thread.cc",
     "chrome_mock_render_thread.h",
     "safe_browsing/mock_feature_extractor_clock.cc",
     "safe_browsing/mock_feature_extractor_clock.h",
     "safe_browsing/test_utils.cc",
     "safe_browsing/test_utils.h",
@@ skipping 17 matching lines @@
     ]
   }
 
   if (is_android) {
     sources -= [
       "safe_browsing/mock_feature_extractor_clock.cc",
       "safe_browsing/mock_feature_extractor_clock.h",
     ]
   }
 }