Decompose //extensions/browser/BUILD.gn

extensions/browser/api/diagnostics/BUILD.gn

Index: extensions/browser/api/diagnostics/BUILD.gn
diff --git a/chromecast/service/BUILD.gn b/extensions/browser/api/diagnostics/BUILD.gn
similarity index 55%
copy from chromecast/service/BUILD.gn
copy to extensions/browser/api/diagnostics/BUILD.gn
index 5334998c2bad5257a8fa47f01bb9e62289d1656a..d2c89da937f393abf712560614184f39d7879168 100644
--- a/chromecast/service/BUILD.gn
+++ b/extensions/browser/api/diagnostics/BUILD.gn
@@ -1,14 +1,15 @@
 # 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("service") {
+source_set("diagnostics") {
   sources = [
-    "cast_service.cc",
-    "cast_service.h",
+    "diagnostics_api.cc",
+    "diagnostics_api.h",
+    "diagnostics_api_chromeos.cc",
   ]
 
   deps = [
-    "//base",
+    "//content/public/browser",
+    "//skia",
   ]
 }