Introduce a layering in the invalidation component as public and impl

components/invalidation/android/proto/serialized_invalidation.proto

Index: components/invalidation/android/proto/serialized_invalidation.proto
diff --git a/components/invalidation/android/proto/serialized_invalidation.proto b/components/invalidation/android/proto/serialized_invalidation.proto
deleted file mode 100644
index c191f7ed26c84cfd4c10571ff3242c3a943312ca..0000000000000000000000000000000000000000
--- a/components/invalidation/android/proto/serialized_invalidation.proto
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright 2015 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.
-//
-// Protocol buffer definition for saving pending invalidations that are
-// received when Chrome is unable to process them (i.e. it is backgrounded).
-//
-syntax = "proto2";
-package org.chromium.components.invalidation;
-option optimize_for = LITE_RUNTIME;
-
-message Invalidation {
-  // Next ID to use: 5
-  optional string object_id = 1;
-  optional int32 object_source = 2;
-  optional int64 version = 3;
-  optional string payload = 4;
-}