base: Remove the string logging from CHECK().

chromecast/media/cma/backend/audio_video_pipeline_device_unittest.cc

Index: chromecast/media/cma/backend/audio_video_pipeline_device_unittest.cc
diff --git a/chromecast/media/cma/backend/audio_video_pipeline_device_unittest.cc b/chromecast/media/cma/backend/audio_video_pipeline_device_unittest.cc
index a912145e0a7f85a7dc684637745d8d1efc73056d..8e15dc21e8bf2f3848bc42b208ce088690f31882 100644
--- a/chromecast/media/cma/backend/audio_video_pipeline_device_unittest.cc
+++ b/chromecast/media/cma/backend/audio_video_pipeline_device_unittest.cc
@@ -567,8 +567,8 @@ std::unique_ptr<BufferFeeder> BufferFeeder::LoadVideo(
   if (raw_h264) {
     base::FilePath file_path = GetTestDataFilePath(filename);
     base::MemoryMappedFile video_stream;
-    CHECK(video_stream.Initialize(file_path)) << "Couldn't open stream file: "
-                                              << file_path.MaybeAsASCII();
+    // Couldn't open stream file.
+    CHECK(video_stream.Initialize(file_path));
     buffers = H264SegmenterForTest(video_stream.data(), video_stream.length());
 
     // TODO(erickung): Either pull data from stream or make caller specify value