Define FilePath::NormalizePathSeparators on all platforms

base/file_path.h

Index: base/file_path.h
diff --git a/base/file_path.h b/base/file_path.h
index 8342c3038374431a431e86799977280d1902fdd8..149ddcedc5553ef878faf1fdbb7145ea0cf9f390 100644
--- a/base/file_path.h
+++ b/base/file_path.h
@@ -341,10 +341,9 @@ class BASE_EXPORT FilePath {
   void WriteToPickle(Pickle* pickle);
   bool ReadFromPickle(Pickle* pickle, void** iter);
 
-#if defined(FILE_PATH_USES_WIN_SEPARATORS)
-  // Normalize all path separators to backslash.
-  FilePath NormalizeWindowsPathSeparators() const;
-#endif
+  // Normalize all path separators to backslash on Windows
+  // (if FILE_PATH_USES_WIN_SEPARATORS is true), or do nothing on POSIX systems.
+  FilePath NormalizePathSeparators() const;
 
   // Compare two strings in the same way the file system does.
   // Note that these always ignore case, even on file systems that are case-