Decompose //extensions/browser/BUILD.gn

extensions/browser/api/declarative/BUILD.gn

Index: extensions/browser/api/declarative/BUILD.gn
diff --git a/extensions/browser/api/declarative/BUILD.gn b/extensions/browser/api/declarative/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..d5e602004e6b86a032a93c662ddce06f8753a3df
--- /dev/null
+++ b/extensions/browser/api/declarative/BUILD.gn
@@ -0,0 +1,25 @@
+# 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("declarative") {
+  sources = [
+    "declarative_api.cc",
+    "declarative_api.h",
+    "declarative_rule.h",
+    "deduping_factory.h",
+    "rules_cache_delegate.cc",
+    "rules_cache_delegate.h",
+    "rules_registry.cc",
+    "rules_registry.h",
+    "rules_registry_service.cc",
+    "rules_registry_service.h",
+    "test_rules_registry.cc",
+    "test_rules_registry.h",
+  ]
+
+  deps = [
+    "//content/public/browser",
+    "//extensions/common/api",
+  ]
+}