drive: Stop mentioning about symlinks

chrome/browser/chromeos/drive/file_system_interface.h

Index: chrome/browser/chromeos/drive/file_system_interface.h
diff --git a/chrome/browser/chromeos/drive/file_system_interface.h b/chrome/browser/chromeos/drive/file_system_interface.h
index 13c715673423ae51f15652934713e793e0ee48c2..b704447cc2d894a518a02ead19af08bb29970361 100644
--- a/chrome/browser/chromeos/drive/file_system_interface.h
+++ b/chrome/browser/chromeos/drive/file_system_interface.h
@@ -444,9 +444,7 @@ class FileSystemInterface {
   // Gets the cache entry for file corresponding to |resource_id| and |md5|
   // and runs |callback| with true and the found entry if the entry exists
   // in the cache map. Otherwise, runs |callback| with false.
-  // |md5| can be empty if only matching |resource_id| is desired, which may
-  // happen when looking for pinned entries where symlinks' filenames have no
-  // extension and hence no md5.
+  // |md5| can be empty if only matching |resource_id| is desired.
   // |callback| must not be null.
   virtual void GetCacheEntryByResourceId(
       const std::string& resource_id,