Decompose //extensions/browser/BUILD.gn

extensions/browser/updater/BUILD.gn

Index: extensions/browser/updater/BUILD.gn
diff --git a/extensions/browser/updater/BUILD.gn b/extensions/browser/updater/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..df80e64d6a71968ca0c984eacace8f6dba14a606
--- /dev/null
+++ b/extensions/browser/updater/BUILD.gn
@@ -0,0 +1,42 @@
+# Copyright 2016 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.
+
+source_set("updater") {
+  sources = [
+    "extension_cache.h",
+    "extension_downloader.cc",
+    "extension_downloader.h",
+    "extension_downloader_delegate.cc",
+    "extension_downloader_delegate.h",
+    "extension_downloader_test_delegate.h",
+    "manifest_fetch_data.cc",
+    "manifest_fetch_data.h",
+    "null_extension_cache.cc",
+    "null_extension_cache.h",
+    "request_queue.h",
+    "request_queue_impl.h",
+    "safe_manifest_parser.cc",
+    "safe_manifest_parser.h",
+    "update_client_config.cc",
+    "update_client_config.h",
+    "update_data_provider.cc",
+    "update_data_provider.h",
+    "update_install_shim.cc",
+    "update_install_shim.h",
+    "update_service.cc",
+    "update_service.h",
+    "update_service_factory.cc",
+    "update_service_factory.h",
+  ]
+
+  configs += [
+    # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
+    "//build/config/compiler:no_size_t_to_int_warning",
+  ]
+
+  deps = [
+    "//extensions/common",
+    "//extensions/strings",
+  ]
+}