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

base/file_util_win.cc

Index: base/file_util_win.cc
diff --git a/base/file_util_win.cc b/base/file_util_win.cc
index 368961459b3efdf46cbba4422a6ae21d3a82ea35..93bfe1dd042c9a326fa5eb78b34cd780dd2646e8 100644
--- a/base/file_util_win.cc
+++ b/base/file_util_win.cc
@@ -702,6 +702,12 @@ bool CreateDirectory(const FilePath& full_path) {
   }
 }
 
+// TODO(rkc): Work out if we want to handle NTFS junctions here or not, handle
+// them if we do decide to.
+bool IsLink(const FilePath& file_path) {
+  return false;
+}
+
 bool GetFileInfo(const FilePath& file_path, base::PlatformFileInfo* results) {
   base::ThreadRestrictions::AssertIOAllowed();