GN: Format more gn files

sdk/lib/rules.gni

Index: sdk/lib/rules.gni
diff --git a/sdk/lib/rules.gni b/sdk/lib/rules.gni
index 27779ea97ff6fc6ec7eaec9dc720c837e462f959..fe51bbbbbbde07168e66cd45dfd3f195a36a2d5b 100644
--- a/sdk/lib/rules.gni
+++ b/sdk/lib/rules.gni
@@ -31,24 +31,29 @@ template("dart_sdk_lib_copy") {
   } else {
     destination = "$root_gen_dir/dart_sdk"
   }
-  dart_sdk_sdk_lib_path =
-      rebase_path("sdk/lib", "", dart_root)
+  dart_sdk_sdk_lib_path = rebase_path("sdk/lib", "", dart_root)
   dart_sdk_tools_gypi_to_gn_path =
       rebase_path("tools/gypi_to_gn.py", "", dart_root)
+
   # The name of the SDK library being copied.
   lib_name = invoker.sdk_lib_name
+
   # The path to the libraries source directory.
   lib_path = rebase_path(lib_name, "", dart_sdk_sdk_lib_path)
+
   # The path to the sources gypi.
   lib_sources_gypi = lib_name + "_sources.gypi"
+
   # Get the contents of the gypi file.
   sdk_lib_sources_gypi =
       exec_script(dart_sdk_tools_gypi_to_gn_path,
-                  [rebase_path(lib_sources_gypi, "", lib_path)],
+                  [ rebase_path(lib_sources_gypi, "", lib_path) ],
                   "scope",
-                  [rebase_path(lib_sources_gypi, "", lib_path)])
+                  [ rebase_path(lib_sources_gypi, "", lib_path) ])
   copy(target_name) {
     sources = rebase_path(sdk_lib_sources_gypi.sources, "", lib_path)
-    outputs = [ "$destination/$lib_name/{{source_file_part}}" ]
+    outputs = [
+      "$destination/$lib_name/{{source_file_part}}",
+    ]
   }
 }