base: Remove the string logging from CHECK().

media/cast/test/fake_media_source.cc

Index: media/cast/test/fake_media_source.cc
diff --git a/media/cast/test/fake_media_source.cc b/media/cast/test/fake_media_source.cc
index 06dd50a9719b0e72d76c7d928383c42bcb7c1ab6..35e5baff392d5f80d6641c15d8033b28d5ba0419 100644
--- a/media/cast/test/fake_media_source.cc
+++ b/media/cast/test/fake_media_source.cc
@@ -289,7 +289,8 @@ void FakeMediaSource::SendNextFakeFrame() {
   while (audio_time < video_time) {
     if (is_transcoding_audio()) {
       Decode(true);
-      CHECK(!audio_bus_queue_.empty()) << "No audio decoded.";
+      // No audio decoded.
+      CHECK(!audio_bus_queue_.empty());
       std::unique_ptr<AudioBus> bus(audio_bus_queue_.front());
       audio_bus_queue_.pop();
       audio_frame_input_->InsertAudio(std::move(bus), start_time_ + audio_time);
@@ -429,8 +430,8 @@ base::TimeDelta FakeMediaSource::AudioFrameTime(int frame_number) {
 }
 
 void FakeMediaSource::Rewind() {
-  CHECK(av_seek_frame(av_format_context_, -1, 0, AVSEEK_FLAG_BACKWARD) >= 0)
-      << "Failed to rewind to the beginning.";
+  // Failed to rewind to the beginning.
+  CHECK(av_seek_frame(av_format_context_, -1, 0, AVSEEK_FLAG_BACKWARD) >= 0);
 }
 
 ScopedAVPacket FakeMediaSource::DemuxOnePacket(bool* audio) {
@@ -466,7 +467,8 @@ void FakeMediaSource::DecodeAudio(ScopedAVPacket packet) {
     int frame_decoded = 0;
     int result = avcodec_decode_audio4(av_audio_context_.get(), avframe,
                                        &frame_decoded, &packet_temp);
-    CHECK(result >= 0) << "Failed to decode audio.";
+    // Failed to decode audio.
+    CHECK(result >= 0);
     packet_temp.size -= result;
     packet_temp.data += result;
     if (!frame_decoded)
@@ -537,9 +539,9 @@ void FakeMediaSource::DecodeVideo(ScopedAVPacket packet) {
   // Video.
   int got_picture;
   AVFrame* avframe = av_frame_alloc();
+  // Video decode error.
   CHECK(avcodec_decode_video2(av_video_context_.get(), avframe, &got_picture,
-                              packet.get()) >= 0)
-      << "Video decode error.";
+                              packet.get()) >= 0);
   if (!got_picture) {
     av_frame_free(&avframe);
     return;