Disallow links from being seen by the extensions via the fileapi.

base/file_util_posix.cc

Index: base/file_util_posix.cc
diff --git a/base/file_util_posix.cc b/base/file_util_posix.cc
index 28d6a61578a4b50a063616a84cbc44ca2a8274e5..99025d068482aa40182b59aa9c5b8fa79982e892 100644
--- a/base/file_util_posix.cc
+++ b/base/file_util_posix.cc
@@ -522,6 +522,23 @@ bool CreateDirectory(const FilePath& full_path) {
   return true;
 }
 
+#if defined(OS_CHROMEOS)
+// TODO(rkc): Refactor GetFileInfo and FileEnumerator to handle symlinks
+// correctly; this is just a hack to fix symlink handling for now for ChromeOS
+bool IsLink(const FilePath& file_path) {
+  struct stat st;
+  // If we can't lstat the file, it's safe to assume that the file won't at
+  // least be a 'followable' link
+  if (lstat(file_path.value().c_str(), &st) != 0)
+    return false;
+
+  if (S_ISLNK(st.st_mode))
+    return true;
+  else
+    return false;
+}
+#endif
+
 bool GetFileInfo(const FilePath& file_path, base::PlatformFileInfo* results) {
   stat_wrapper_t file_info;
   if (CallStat(file_path.value().c_str(), &file_info) != 0)