Update from chromium https://crrev.com/304586

base/files/file_util.h

Index: base/files/file_util.h
diff --git a/base/files/file_util.h b/base/files/file_util.h
index ecc0d581dab8a29f70d6d1463c6aacd6d45b3e9a..7f169f1c54b7b58f05c9a31d8eb0f67e4f1acad0 100644
--- a/base/files/file_util.h
+++ b/base/files/file_util.h
@@ -421,11 +421,6 @@ namespace internal {
 BASE_EXPORT bool MoveUnsafe(const FilePath& from_path,
                             const FilePath& to_path);
 
-// Same as CopyFile but allows paths with traversal components.
-// Use only with extreme care.
-BASE_EXPORT bool CopyFileUnsafe(const FilePath& from_path,
-                                const FilePath& to_path);
-
 #if defined(OS_WIN)
 // Copy from_path to to_path recursively and then delete from_path recursively.
 // Returns true if all operations succeed.