Convert some GN test support targets to static libs.

remoting/host/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("//build/config/ui.gni")
 import("//build/config/win/manifest.gni")
 import("//build/util/version.gni")
 import("//chrome/version.gni")
 import("//remoting/remoting_enable.gni")
@@ skipping 216 matching lines @@
   }
 
   if (is_android) {
     sources -= [
       "single_window_desktop_environment.cc",
       "single_window_desktop_environment.h",
     ]
   }
 }
 
-source_set("test_support") {
+static_library("test_support") {
   testonly = true
 
   sources = [
     "fake_desktop_environment.cc",
     "fake_desktop_environment.h",
     "fake_host_extension.cc",
     "fake_host_extension.h",
     "fake_host_status_monitor.h",
     "fake_host_status_monitor.h",
     "fake_mouse_cursor_monitor.cc",
@@ skipping 609 matching lines @@
     }
 
     deps = [
       "//remoting/resources",
       "//remoting/resources:strings",
     ]
   }
 }
 
 if (enable_me2me_host) {
-  source_set("remoting_me2me_host_static") {
+  static_library("remoting_me2me_host_static") {
     sources = [
       "pam_authorization_factory_posix.cc",
       "pam_authorization_factory_posix.h",
       "remoting_me2me_host.cc",
     ]
     defines = []
 
     configs += [ "//remoting:version" ]
 
     deps = [
@@ skipping 677 matching lines @@
                       root_build_dir),
           rebase_path(outputs[0], root_build_dir),
         ]
       }
     } else {
       group("remoting_host_installation") {
       }
     }
   }
 }