Delete CopyRecursiveDirNoCache from test_file_util.

base/test/test_file_util.h

Index: base/test/test_file_util.h
diff --git a/base/test/test_file_util.h b/base/test/test_file_util.h
index 8d1be1ccf43be9734c30cc1f1d3a1e3dff6065e3..c41045eeacf76298eeb8f23221039b59a87fee65 100644
--- a/base/test/test_file_util.h
+++ b/base/test/test_file_util.h
@@ -27,15 +27,6 @@ bool DieFileDie(const base::FilePath& file, bool recurse);
 // to access this file will result in a cold load from the hard drive.
 bool EvictFileFromSystemCache(const base::FilePath& file);
 
-// Like CopyFileNoCache but recursively copies all files and subdirectories
-// in the given input directory to the output directory. Any files in the
-// destination that already exist will be overwritten.
-//
-// Returns true on success. False means there was some error copying, so the
-// state of the destination is unknown.
-bool CopyRecursiveDirNoCache(const base::FilePath& source_dir,
-                             const base::FilePath& dest_dir);
-
 #if defined(OS_WIN)
 // Returns true if the volume supports Alternate Data Streams.
 bool VolumeSupportsADS(const base::FilePath& path);