* Revert "Por rt flush_cache tool."

base/file_util_linux.cc

Index: base/file_util_linux.cc
diff --git a/base/file_util_linux.cc b/base/file_util_linux.cc
index d2a68706da6051d9557ae7147755c62402eea029..f776c917b74a51f0da876eb808e0ab8b2dd0e284 100644
--- a/base/file_util_linux.cc
+++ b/base/file_util_linux.cc
@@ -72,16 +72,4 @@ bool CopyFile(const FilePath& from_path, const FilePath& to_path) {
   return result;
 }
 
-bool EvictFileFromSystemCache(const FilePath path) {
-  int fd = open(path.value().c_str(), O_RDONLY);
-  if (fd < 0)
-    return false;
-  if (fdatasync(fd) != 0)
-    return false;
-  if (posix_fadvise(fd, 0, 0, POSIX_FADV_DONTNEED) != 0)
-    return false;
-  close(fd);
-  return true;
-}
-
 }  // namespace file_util