base: Remove the string logging from CHECK().

media/test/pipeline_integration_test_base.cc

Index: media/test/pipeline_integration_test_base.cc
diff --git a/media/test/pipeline_integration_test_base.cc b/media/test/pipeline_integration_test_base.cc
index 422caa31f30c874e92b0f45e2056667b1b2673ef..3a42013f594388fb02a91c51a0ee3a08f7eda385 100644
--- a/media/test/pipeline_integration_test_base.cc
+++ b/media/test/pipeline_integration_test_base.cc
@@ -182,8 +182,9 @@ PipelineStatus PipelineIntegrationTestBase::StartWithFile(
     ScopedVector<AudioDecoder> prepend_audio_decoders) {
   std::unique_ptr<FileDataSource> file_data_source(new FileDataSource());
   base::FilePath file_path(GetTestDataFilePath(filename));
-  CHECK(file_data_source->Initialize(file_path)) << "Is " << file_path.value()
-                                                 << " missing?";
+  //  missing?
+  // Is |file_path.value()|.
+  CHECK(file_data_source->Initialize(file_path));
   return StartInternal(std::move(file_data_source), cdm_context, test_type,
                        std::move(prepend_video_decoders),
                        std::move(prepend_audio_decoders));