base: Support setting thread priorities generically.

content/renderer/media/webrtc_local_audio_track_unittest.cc

Index: content/renderer/media/webrtc_local_audio_track_unittest.cc
diff --git a/content/renderer/media/webrtc_local_audio_track_unittest.cc b/content/renderer/media/webrtc_local_audio_track_unittest.cc
index 7e2f4732b508d5c17937ae7eb4cf3b2919ba8476..52a2a9648a4c490546670e89ea2da85c7e291a4b 100644
--- a/content/renderer/media/webrtc_local_audio_track_unittest.cc
+++ b/content/renderer/media/webrtc_local_audio_track_unittest.cc
@@ -36,7 +36,7 @@ class FakeAudioThread : public base::PlatformThread::Delegate {
     audio_bus_ = media::AudioBus::Create(capturer_->audio_parameters());
   }
 
-  virtual ~FakeAudioThread() { DCHECK(!thread_); }
+  virtual ~FakeAudioThread() { DCHECK(thread_.is_null()); }
 
   // base::PlatformThread::Delegate:
   virtual void ThreadMain() OVERRIDE {
@@ -57,7 +57,7 @@ class FakeAudioThread : public base::PlatformThread::Delegate {
   void Start() {
     base::PlatformThread::CreateWithPriority(
         0, this, &thread_, base::kThreadPriority_RealtimeAudio);
-    CHECK(thread_ != base::kNullThreadHandle);
+    CHECK(!thread_.is_null());
   }
 
   void Stop() {