Convert some GN test support targets to static libs.

media/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/buildflag_header.gni")
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/features.gni")
 import("//build/config/linux/pkg_config.gni")
 import("//build/config/ui.gni")
@@ skipping 465 matching lines @@
     "//third_party/libwebm",
     "//third_party/libyuv",
     "//ui/events:events_base",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gl:gl",
     "//url",
   ]
 }
 
-source_set("cdm_paths") {
+static_library("cdm_paths") {
   sources = [
     "cdm/cdm_paths.cc",
     "cdm/cdm_paths.h",
   ]
   deps = [
     "//base",
   ]
 }
 
 # Minimal media component for media/cast on iOS.
@@ skipping 251 matching lines @@
   ]
   deps = [
     ":test_support",
     "//base/test:test_support",
     "//media/audio:unittests",
     "//media/base:test_support",
     "//ui/gfx:test_support",
   ]
 }
 
-source_set("test_support") {
+static_library("test_support") {
   testonly = true
   sources = [
     "renderers/mock_gpu_memory_buffer_video_frame_pool.cc",
     "renderers/mock_gpu_memory_buffer_video_frame_pool.h",
     "renderers/mock_gpu_video_accelerator_factories.cc",
     "renderers/mock_gpu_video_accelerator_factories.h",
     "video/mock_video_decode_accelerator.cc",
     "video/mock_video_decode_accelerator.h",
   ]
   public_deps = [
@@ skipping 111 matching lines @@
   sources = [
     "filters/vpx_video_decoder_fuzzertest.cc",
   ]
   deps = [
     ":media",
     "//base",
   ]
   libfuzzer_options = [ "max_len = 400000" ]
   seed_corpus = "//media/test/data"
 }