gdata: Remove a DCHECK that does not make sense.

chrome/browser/chromeos/gdata/gdata_file_system_proxy.cc

Index: chrome/browser/chromeos/gdata/gdata_file_system_proxy.cc
diff --git a/chrome/browser/chromeos/gdata/gdata_file_system_proxy.cc b/chrome/browser/chromeos/gdata/gdata_file_system_proxy.cc
index 088833b1b7e13862a0342f4730681e0a6bfa0d14..992a6949af1f697df5197f31738d41b1f575e97f 100644
--- a/chrome/browser/chromeos/gdata/gdata_file_system_proxy.cc
+++ b/chrome/browser/chromeos/gdata/gdata_file_system_proxy.cc
@@ -248,8 +248,6 @@ void GDataFileSystemProxy::OnReadDirectory(
     callback,
     base::PlatformFileError error,
     scoped_ptr<gdata::GDataDirectoryProto> directory_proto) {
-  DCHECK(error != base::PLATFORM_FILE_OK);
-
   if (error != base::PLATFORM_FILE_OK) {
     callback.Run(error, std::vector<base::FileUtilProxy::Entry>(), false);
     return;