Decompose //extensions/browser/BUILD.gn

extensions/browser/api/declarative_webrequest/BUILD.gn

Index: extensions/browser/api/declarative_webrequest/BUILD.gn
diff --git a/extensions/browser/api/declarative_webrequest/BUILD.gn b/extensions/browser/api/declarative_webrequest/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..033ce08c1137f9815fb3d9d9d91480fd24f0c56e
--- /dev/null
+++ b/extensions/browser/api/declarative_webrequest/BUILD.gn
@@ -0,0 +1,25 @@
+# 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.
+source_set("declarative_webrequest") {
+  sources = [
+    "request_stage.cc",
+    "request_stage.h",
+    "webrequest_action.cc",
+    "webrequest_action.h",
+    "webrequest_condition.cc",
+    "webrequest_condition.h",
+    "webrequest_condition_attribute.cc",
+    "webrequest_condition_attribute.h",
+    "webrequest_constants.cc",
+    "webrequest_constants.h",
+    "webrequest_rules_registry.cc",
+    "webrequest_rules_registry.h",
+  ]
+
+  deps = [
+    "//content/public/browser",
+    "//skia",
+    "//third_party/re2",
+  ]
+}