Use a two-part data format version in IndexedDB metadata.

content/browser/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//gpu/vulkan/features.gni")
 import("//media/media_options.gni")
 import("//ppapi/features/features.gni")
 import("//printing/features/features.gni")
@@ skipping 743 matching lines @@
     "indexed_db/indexed_db_callbacks.cc",
     "indexed_db/indexed_db_callbacks.h",
     "indexed_db/indexed_db_class_factory.cc",
     "indexed_db/indexed_db_class_factory.h",
     "indexed_db/indexed_db_connection.cc",
     "indexed_db/indexed_db_connection.h",
     "indexed_db/indexed_db_context_impl.cc",
     "indexed_db/indexed_db_context_impl.h",
     "indexed_db/indexed_db_cursor.cc",
     "indexed_db/indexed_db_cursor.h",
+    "indexed_db/indexed_db_data_format_version.cc",
+    "indexed_db/indexed_db_data_format_version.h",
     "indexed_db/indexed_db_data_loss_info.h",
     "indexed_db/indexed_db_database.cc",
     "indexed_db/indexed_db_database.h",
     "indexed_db/indexed_db_database_callbacks.cc",
     "indexed_db/indexed_db_database_callbacks.h",
     "indexed_db/indexed_db_database_error.cc",
     "indexed_db/indexed_db_database_error.h",
     "indexed_db/indexed_db_dispatcher_host.cc",
     "indexed_db/indexed_db_dispatcher_host.h",
     "indexed_db/indexed_db_factory.h",
@@ skipping 1280 matching lines @@
   if (!is_component_build) {
     public_deps = [
       ":browser",
     ]
   } else {
     public_deps = [
       "//third_party/leveldatabase",
     ]
   }
 }