[sync] Componentize sync: Part 6: Add more SYNC_EXPORTs to files in src/sync/

sync/internal_api/public/engine/polling_constants.h

Index: sync/internal_api/public/engine/polling_constants.h
diff --git a/sync/internal_api/public/engine/polling_constants.h b/sync/internal_api/public/engine/polling_constants.h
index 8a57f281462947f4de16555df69c63603f86af7a..8f4f100b0ae67e9336c35af82a96293bdccfc772 100644
--- a/sync/internal_api/public/engine/polling_constants.h
+++ b/sync/internal_api/public/engine/polling_constants.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright 2012 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.
 //
@@ -11,8 +11,8 @@
 
 namespace syncer {
 
-extern const int64 kDefaultShortPollIntervalSeconds;
-extern const int64 kDefaultLongPollIntervalSeconds;
+SYNC_EXPORT_PRIVATE extern const int64 kDefaultShortPollIntervalSeconds;
+SYNC_EXPORT_PRIVATE extern const int64 kDefaultLongPollIntervalSeconds;
 SYNC_EXPORT extern const int64 kMaxBackoffSeconds;
 SYNC_EXPORT extern const int kBackoffRandomizationFactor;
 SYNC_EXPORT_PRIVATE extern const int kInitialBackoffRetrySeconds;