[Sync] use base::Time in sync

chrome/browser/sync/syncable/syncable_enum_conversions.cc

Index: chrome/browser/sync/syncable/syncable_enum_conversions.cc
diff --git a/chrome/browser/sync/syncable/syncable_enum_conversions.cc b/chrome/browser/sync/syncable/syncable_enum_conversions.cc
index 95afe496e16571d06f107f68e6bee05ecbdacfd0..0a371d97892d48849498094366f8d42d3f47843b 100644
--- a/chrome/browser/sync/syncable/syncable_enum_conversions.cc
+++ b/chrome/browser/sync/syncable/syncable_enum_conversions.cc
@@ -48,13 +48,23 @@ const char* GetInt64FieldString(Int64Field int64_field) {
                      BASE_VERSION + 1, INT64_FIELDS_END - 1);
   switch (int64_field) {
     ENUM_CASE(SERVER_VERSION);
+    ENUM_CASE(SERVER_POSITION_IN_PARENT);
+    ENUM_CASE(LOCAL_EXTERNAL_ID);
+    case INT64_FIELDS_END: break;
+  }
+  NOTREACHED();
+  return "";
+}
+
+const char* GetTimeFieldString(TimeField time_field) {
+  ASSERT_ENUM_BOUNDS(SERVER_VERSION, LOCAL_EXTERNAL_ID,
+                     BASE_VERSION + 1, INT64_FIELDS_END - 1);
+  switch (time_field) {
     ENUM_CASE(MTIME);
     ENUM_CASE(SERVER_MTIME);
     ENUM_CASE(CTIME);
     ENUM_CASE(SERVER_CTIME);
-    ENUM_CASE(SERVER_POSITION_IN_PARENT);
-    ENUM_CASE(LOCAL_EXTERNAL_ID);
-    case INT64_FIELDS_END: break;
+    case TIME_FIELDS_END: break;
   }
   NOTREACHED();
   return "";