gdata: Remove a DCHECK that does not make sense.

This was introduced in crrev.com/134770

- DCHECK(entry || error != base::PLATFORM_FILE_OK);
+ DCHECK(error != base::PLATFORM_FILE_OK);

The latter does not make sense, as we are mostly expecting
error to be base::PLATFORM_FILE_OK. Besides, the read directory
operation can fail for various reasons.

BUG=chromium-os:30251
TEST=the DCHECK failure is gone with --enable-dcheck

Review URL: https://chromiumcodereview.appspot.com/10279002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@134784 0039d316-1c4b-4281-b951-d872f2087c98

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;