Convert test_support source sets to static libs

chrome/test/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/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/chrome_tests.gni")
@@ skipping 644 matching lines @@
       }
     }  # enable_notifications
 
     if (!use_aura || is_chromeos) {
       sources -=
           [ "../../ui/views/corewm/desktop_capture_controller_unittest.cc" ]
     }
   }
 
   if (enable_app_list && use_ash) {
-    source_set("test_support_applist_ash") {
+    static_library("test_support_applist_ash") {
       defines = []
       testonly = true
 
       sources = rebase_path(
               chrome_tests_gypi_values.chrome_browser_app_list_ash_test_support_sources,
               ".",
               "//chrome")
 
       deps = [
         "//chrome/browser/ui",
         "//ui/app_list/presenter:test_support",
       ]
     }
   }
 
-  source_set("sync_integration_test_support") {
+  static_library("sync_integration_test_support") {
     testonly = true
     sources = rebase_path(
             chrome_tests_gypi_values.test_support_sync_integration_sources,
             ".",
             "//chrome")
     public_deps = [
       "//chrome/browser",
     ]
     deps = [
       ":test_support",
@@ skipping 1732 matching lines @@
     }
     if (!is_mac) {
       sources -= [ "perf/mach_ports_performancetest.cc" ]
     }
 
     # This target should not require the Chrome executable to run.
     assert_no_deps = [ "//chrome" ]
   }
 }
 
-source_set("test_support_unit") {
+static_library("test_support_unit") {
   testonly = true
   sources = [
     "../browser/sync/glue/session_sync_test_helper.cc",
     "../browser/sync/glue/session_sync_test_helper.h",
     "base/run_all_unittests.cc",
   ]
 
   public_deps = [
     ":test_support",
     "//base",
@@ skipping 15 matching lines @@
 if (is_android) {
   android_library("unit_tests_java") {
     java_files = [ "android/unit_tests_apk/src/org/chromium/chrome/unit_tests_apk/ChromeNativeTestApplication.java" ]
     deps = [
       "//base:base_java",
       "//chrome/android:chrome_java",
       "//content/public/android:content_java",
     ]
   }
 }