Convert some GN test support targets to static libs.

remoting/client/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("//remoting/remoting_srcs.gni")
 
-source_set("client") {
+static_library("client") {
   # Disabled the source filters because there are _mac files that need to
   # be compiled on all platforms.
   set_sources_assignment_filter([])
   sources = rebase_path(remoting_srcs_gypi_values.remoting_client_sources,
                         ".",
                         "//remoting")
   set_sources_assignment_filter(sources_assignment_filter)
 
   configs += [
     "//build/config/compiler:wexit_time_destructors",
@@ skipping 37 matching lines @@
     ]
 
     deps = [
       "//third_party/webrtc",
     ]
 
     configs += [ "//third_party/khronos:khronos_headers" ]
   }
 }
 
-source_set("test_support") {
+static_library("test_support") {
   testonly = true
 
   sources = [
     "fake_audio_consumer.cc",
     "fake_audio_consumer.h",
   ]
 
   public_deps = [
     "//remoting/protocol:test_support",
     "//testing/gmock",
@@ skipping 31 matching lines @@
 
   deps = [
     ":client",
     ":test_support",
     "//remoting/proto",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/webrtc",
   ]
 }