[PoC] Reformat all BUILD.gn and *.gni files with new gn.

extensions/BUILD.gn

 # Copyright 2014 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.
 
 # TODO(rockot) bug 505926: Don't include chrome files from here.
 # See chrome_browser_tests_extensions_sources below
 import("//chrome/chrome_tests.gni")
 import("//extensions/extensions.gni")
 import("//testing/test.gni")
 import("//tools/grit/grit_rule.gni")
@@ skipping 324 matching lines @@
     "//media/cast:test_support",
     "//net",
     "//net:test_support",
     "//sdch",
     "//skia",
     "//sync",
     "//sync:test_support_sync_api",
     "//testing/gmock",
     "//testing/gtest",
     "//testing/perf",
+    "//third_party/WebKit/public:blink",
     "//third_party/cacheinvalidation",
     "//third_party/icu",
     "//third_party/leveldatabase",
     "//third_party/libaddressinput",
     "//third_party/libjingle",
     "//third_party/safe_browsing:test_support",
-    "//third_party/WebKit/public:blink",
     "//third_party/webrtc/modules/desktop_capture",
     "//third_party/widevine/cdm:version_h",
     "//ui/accessibility:test_support",
     "//ui/base:test_support",
     "//ui/compositor:test_support",
     "//ui/resources",
     "//ui/web_dialogs:test_support",
     "//v8",
   ]
 }
@@ skipping 30 matching lines @@
     "//testing/gtest",
     "//third_party/hunspell",
     "//third_party/icu",
     "//third_party/libpng",
     "//third_party/zlib",
     "//ui/base:test_support",
     "//ui/resources:ui_test_pak",
     "//ui/web_dialogs:test_support",
   ]
 }