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

sync/internal_api/public/base/invalidation.cc

Index: sync/internal_api/public/base/invalidation.cc
diff --git a/sync/internal_api/public/base/invalidation.cc b/sync/internal_api/public/base/invalidation.cc
index 58f5ccea85bc3d7db49f93824350de6c827ab097..1fb7a0c3dc34fa59428d65ee9285d758587f804e 100644
--- a/sync/internal_api/public/base/invalidation.cc
+++ b/sync/internal_api/public/base/invalidation.cc
@@ -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.
 
@@ -61,10 +61,16 @@ AckHandle::AckHandle(const std::string& state, base::Time timestamp)
     : state_(state), timestamp_(timestamp) {
 }
 
+AckHandle::~AckHandle() {
+}
+
 Invalidation::Invalidation()
     : ack_handle(AckHandle::InvalidAckHandle()) {
 }
 
+Invalidation::~Invalidation() {
+}
+
 bool Invalidation::Equals(const Invalidation& other) const {
   return (payload == other.payload) && ack_handle.Equals(other.ack_handle);
 }