Decompose //extensions/browser/BUILD.gn

extensions/browser/api/storage/BUILD.gn

Index: extensions/browser/api/storage/BUILD.gn
diff --git a/extensions/browser/api/storage/BUILD.gn b/extensions/browser/api/storage/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..97c592b68fe4f94c8482420f65bf0f9773d27e3f
--- /dev/null
+++ b/extensions/browser/api/storage/BUILD.gn
@@ -0,0 +1,27 @@
+# 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("storage") {
+  sources = [
+    "local_value_store_cache.cc",
+    "local_value_store_cache.h",
+    "settings_namespace.cc",
+    "settings_namespace.h",
+    "settings_observer.h",
+    "settings_storage_quota_enforcer.cc",
+    "settings_storage_quota_enforcer.h",
+    "storage_api.cc",
+    "storage_api.h",
+    "storage_frontend.cc",
+    "storage_frontend.h",
+    "value_store_cache.cc",
+    "value_store_cache.h",
+    "weak_unlimited_settings_storage.cc",
+    "weak_unlimited_settings_storage.h",
+  ]
+
+  deps = [
+    "//extensions/common/api",
+  ]
+}