gn format '.gni' files.

third_party/WebKit/Source/bindings/modules/idl.gni

 # 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.
 
 import("//third_party/WebKit/Source/bindings/core/idl.gni")
 import("//third_party/WebKit/Source/bindings/modules/modules.gni")
 import("//third_party/WebKit/Source/modules/modules.gni")
 
 # IDL file lists; see: http://www.chromium.org/developers/web-idl-interfaces
 
-modules_definition_idl_files =
-  modules_dictionary_idl_files +
-  modules_idl_files
+modules_definition_idl_files = modules_dictionary_idl_files + modules_idl_files
 
 # Static IDL files
-modules_static_interface_idl_files =
-  modules_definition_idl_files
+modules_static_interface_idl_files = modules_definition_idl_files
 modules_static_dependency_idl_files =
-  modules_dependency_idl_files +
-  modules_testing_dependency_idl_files
+    modules_dependency_idl_files + modules_testing_dependency_idl_files
 
 # Static IDL files / Generated IDL files
 #
 # In GYP, paths need to be passed separately for static and generated files, as
 # static files are listed in a temporary file (b/c too long for command line),
 # but generated files must be passed at the command line, as their paths are
 # not fixed at GYP time, when the temporary file is generated, because their
 # paths depend on the build directory, which varies.
 #
 # FIXME: GN does not have this limitation and we can combine the lists.
 # Currently we keep the GYP/GN builds in sync for simplicity, but this can be
 # cleaned up once GYP is not used.
 modules_static_idl_files =
-  modules_static_interface_idl_files +
-  modules_static_dependency_idl_files
+    modules_static_interface_idl_files + modules_static_dependency_idl_files
 
 modules_generated_dependency_idl_files =
-  modules_core_global_constructors_generated_idl_files +
-  modules_global_constructors_generated_idl_files
+    modules_core_global_constructors_generated_idl_files +
+    modules_global_constructors_generated_idl_files
 
 # 'modules_dependency_idl_files' is already used in Source/modules, so avoid
 # collision
 modules_all_dependency_idl_files =
-  modules_static_dependency_idl_files +
-  modules_generated_dependency_idl_files
+    modules_static_dependency_idl_files + modules_generated_dependency_idl_files
 
 # Dependency IDL files: don't generate individual bindings, but do process
 # in IDL dependency computation, and count as build dependencies
 all_dependency_idl_files =
-  core_all_dependency_idl_files +
-  modules_all_dependency_idl_files
+    core_all_dependency_idl_files + modules_all_dependency_idl_files