Convert some GN test support targets to static libs.

remoting/BUILD.gn

 # Copyright 2015 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("//build/config/ui.gni")
 import("//build/util/version.gni")
 import("//remoting/remoting_enable.gni")
 import("//remoting/remoting_options.gni")
 import("//remoting/remoting_version.gni")
@@ skipping 95 matching lines @@
 
     configs += [ "//build/config/compiler:wexit_time_destructors" ]
 
     sources = [
       "tools/breakpad_tester_win.cc",
     ]
   }
 }
 
 # GYP version: remoting/remoting_test.gypi:remoting_test_support
-source_set("test_support") {
+group("test_support") {
   testonly = true
 
   deps = [
     "//base",
     "//net",
     "//remoting/base",
     "//remoting/client",
     "//remoting/codec",
     "//remoting/protocol:test_support",
     "//remoting/resources",
@@ skipping 91 matching lines @@
       "//testing/gtest",
       "//third_party/libjingle",
       "//third_party/webrtc/modules/desktop_capture",
     ]
 
     if (enable_webrtc) {
       deps += [ "//third_party/libjingle:libjingle_webrtc" ]
     }
   }
 }