Apply gn format with 'sources' sorting to src/

extensions/BUILD.gn

Index: extensions/BUILD.gn
diff --git a/extensions/BUILD.gn b/extensions/BUILD.gn
index 5280a42945f80d836c657c1be38c0e1f72a79478..ae914e3ce10a137b4d6bc8f2ad5fa884d179e2ff 100644
--- a/extensions/BUILD.gn
+++ b/extensions/BUILD.gn
@@ -70,6 +70,7 @@ source_set("test_support") {
   sources = rebase_path(extensions_gypi_values.extensions_test_support_sources,
                         ".",
                         "//extensions")
+
   # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
@@ -97,6 +98,7 @@ source_set("test_support") {
 # GYP version: //extensions/extensions.gyp:extensions_shell_and_test_pak
 repack("shell_and_test_pak") {
   sources = [
+    "$root_gen_dir/blink/devtools_resources.pak",
     "$root_gen_dir/blink/public/resources/blink_resources.pak",
     "$root_gen_dir/content/app/strings/content_strings_en-US.pak",
     "$root_gen_dir/content/content_resources.pak",
@@ -109,7 +111,6 @@ repack("shell_and_test_pak") {
     "$root_gen_dir/ui/resources/ui_resources_100_percent.pak",
     "$root_gen_dir/ui/strings/app_locale_settings_en-US.pak",
     "$root_gen_dir/ui/strings/ui_strings_en-US.pak",
-    "$root_gen_dir/blink/devtools_resources.pak",
   ]
 
   output = "$root_out_dir/extensions_shell_and_test.pak"