Add path traversal protection to Move and CopyFile too.

base/file_util.h

Index: base/file_util.h
===================================================================
--- base/file_util.h	(revision 180593)
+++ base/file_util.h	(working copy)
@@ -120,9 +120,15 @@
 // If a simple rename is not possible, such as in the case where the paths are
 // on different volumes, this will attempt to copy and delete. Returns
 // true for success.
+// This function fails if either path contains traversal components ('..').
 BASE_EXPORT bool Move(const base::FilePath& from_path,
                       const base::FilePath& to_path);
 
+// Same as Move but allows paths with traversal components.
+// Use only with extreme care.
+BASE_EXPORT bool MoveUnsafe(const base::FilePath& from_path,
+                            const base::FilePath& to_path);
+
 // Renames file |from_path| to |to_path|. Both paths must be on the same
 // volume, or the function will fail. Destination file will be created
 // if it doesn't exist. Prefer this function over Move when dealing with
@@ -132,9 +138,15 @@
                              const base::FilePath& to_path);
 
 // Copies a single file. Use CopyDirectory to copy directories.
+// This function fails if either path contains traversal components ('..').
 BASE_EXPORT bool CopyFile(const base::FilePath& from_path,
                           const base::FilePath& to_path);
 
+// Same as CopyFile but allows paths with traversal components.
+// Use only with extreme care.
+BASE_EXPORT bool CopyFileUnsafe(const base::FilePath& from_path,
+                                const base::FilePath& to_path);
+
 // Copies the given path, and optionally all subdirectories and their contents
 // as well.
 // If there are files existing under to_path, always overwrite.