[Sync] Convert sync to a static library.

components/sync/base/node_ordinal.h

Index: components/sync/base/node_ordinal.h
diff --git a/components/sync/base/node_ordinal.h b/components/sync/base/node_ordinal.h
index 60813288c535d639691ea673a7637ae56bfcdd50..385ef040e1f9400b9f4299783e413e1793c681ba 100644
--- a/components/sync/base/node_ordinal.h
+++ b/components/sync/base/node_ordinal.h
@@ -9,7 +9,6 @@
 #include <stdint.h>
 
 #include "components/sync/base/ordinal.h"
-#include "components/sync/base/sync_export.h"
 
 namespace syncer {
 
@@ -44,13 +43,13 @@ static_assert(NodeOrdinal::kRadix == 256, "NodeOrdinal has incorrect radix");
 // field of SyncEntity) to a NodeOrdinal.  This transformation
 // preserves the ordering relation: a < b under integer ordering if
 // and only if Int64ToNodeOrdinal(a) < Int64ToNodeOrdinal(b).
-SYNC_EXPORT NodeOrdinal Int64ToNodeOrdinal(int64_t x);
+NodeOrdinal Int64ToNodeOrdinal(int64_t x);
 
 // The inverse of Int64ToNodeOrdinal.  This conversion is, in general,
 // lossy: NodeOrdinals can have arbitrary fidelity, while numeric
 // positions contain only 64 bits of information (in fact, this is the
 // reason we've moved away from them).
-SYNC_EXPORT int64_t NodeOrdinalToInt64(const NodeOrdinal& ordinal);
+int64_t NodeOrdinalToInt64(const NodeOrdinal& ordinal);
 
 }  // namespace syncer