[Sync] Convert sync to a static library.

components/sync/base/time.h

Index: components/sync/base/time.h
diff --git a/components/sync/base/time.h b/components/sync/base/time.h
index 6150f468d5c0b68b187ad63145c8fac72c4fa987..6e182ab4d057566c81464b7f7ef80535b9b27126 100644
--- a/components/sync/base/time.h
+++ b/components/sync/base/time.h
@@ -12,18 +12,17 @@
 #include <string>
 
 #include "base/time/time.h"
-#include "components/sync/base/sync_export.h"
 
 namespace syncer {
 
 // Converts a time object to the format used in sync protobufs (ms
 // since the Unix epoch).
-SYNC_EXPORT int64_t TimeToProtoTime(const base::Time& t);
+int64_t TimeToProtoTime(const base::Time& t);
 
 // Converts a time field from sync protobufs to a time object.
-SYNC_EXPORT base::Time ProtoTimeToTime(int64_t proto_t);
+base::Time ProtoTimeToTime(int64_t proto_t);
 
-SYNC_EXPORT std::string GetTimeDebugString(const base::Time& t);
+std::string GetTimeDebugString(const base::Time& t);
 
 }  // namespace syncer