Fix some warnings on Mac that are treated as errors:...

chrome/browser/sync/syncable/syncable.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_SYNC_SYNCABLE_SYNCABLE_H_
 #define CHROME_BROWSER_SYNC_SYNCABLE_SYNCABLE_H_
 
 #include <algorithm>
 #include <bitset>
 #include <iosfwd>
@@ skipping 821 matching lines @@
   friend class BaseTransaction;
   friend class Entry;
   friend class ExtendedAttribute;
   friend class MutableEntry;
   friend class MutableExtendedAttribute;
   friend class ReadTransaction;
   friend class ReadTransactionWithoutDB;
   friend class ScopedKernelLock;
   friend class ScopedKernelUnlock;
   friend class WriteTransaction;
-  friend class TestUnsaveableDirectory;
  public:
   // Various data that the Directory::Kernel we are backing (persisting data
   // for) needs saved across runs of the application.
   struct PersistedKernelInfo {
     int64 last_sync_timestamp;
     bool initial_sync_ended;
     std::string store_birthday;
     int64 next_id;
     PersistedKernelInfo() : last_sync_timestamp(0),
         initial_sync_ended(false),
@@ skipping 464 matching lines @@
 void ZeroFields(EntryKernel* entry, int first_field);
 
 }  // namespace syncable
 
 std::ostream& operator <<(std::ostream&, const syncable::Blob&);
 
 browser_sync::FastDump& operator <<
   (browser_sync::FastDump&, const syncable::Blob&);
 
 #endif  // CHROME_BROWSER_SYNC_SYNCABLE_SYNCABLE_H_