Move more file_util functions to base namespace.

media/audio/win/audio_unified_win_unittest.cc

Index: media/audio/win/audio_unified_win_unittest.cc
diff --git a/media/audio/win/audio_unified_win_unittest.cc b/media/audio/win/audio_unified_win_unittest.cc
index 6c3666523bcd870f32d2b6dd50fa4d67dde41d59..15573aec76a62ccd1cf5c73ccfbea4ced72b3dd0 100644
--- a/media/audio/win/audio_unified_win_unittest.cc
+++ b/media/audio/win/audio_unified_win_unittest.cc
@@ -74,7 +74,7 @@ class UnifiedSourceCallback : public AudioOutputStream::AudioSourceCallback {
     file_name = file_name.AppendASCII(kDeltaTimeMsFileName);
 
     EXPECT_TRUE(!text_file_);
-    text_file_ = file_util::OpenFile(file_name, "wt");
+    text_file_ = base::OpenFile(file_name, "wt");
     DLOG_IF(ERROR, !text_file_) << "Failed to open log file.";
     VLOG(0) << ">> Output file " << file_name.value() << " has been created.";
 
@@ -84,7 +84,7 @@ class UnifiedSourceCallback : public AudioOutputStream::AudioSourceCallback {
       fprintf(text_file_, "%d\n", delta_times_[elements_written]);
       ++elements_written;
     }
-    file_util::CloseFile(text_file_);
+    base::CloseFile(text_file_);
   }
 
   virtual int OnMoreData(AudioBus* dest,