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

sync/engine/syncer.h

Index: sync/engine/syncer.h
diff --git a/sync/engine/syncer.h b/sync/engine/syncer.h
index 4bcac920d00ca133226e25698ad3993eb25c2321..ac7892e1e523c88b29db3f0134b1fab5a53dcf08 100644
--- a/sync/engine/syncer.h
+++ b/sync/engine/syncer.h
@@ -11,6 +11,7 @@
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/synchronization/lock.h"
+#include "sync/base/sync_export.h"
 #include "sync/engine/conflict_resolver.h"
 #include "sync/engine/syncer_types.h"
 #include "sync/internal_api/public/base/model_type.h"
@@ -44,7 +45,7 @@ enum SyncerStep {
 // to SyncShare() may take an unbounded amount of time, as SyncerCommands
 // may block on network i/o, on lock contention, or on tasks posted to
 // other threads.
-class Syncer {
+class SYNC_EXPORT_PRIVATE Syncer {
  public:
   typedef std::vector<int64> UnsyncedMetaHandles;