gn: Cleanup - Sort GYP sources list alphabetical.

tools/gn/gn.gyp

 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
       'target_name': 'gn_lib',
       'type': 'static_library',
       'dependencies': [
         '../../base/base.gyp:base',
@@ skipping 12 matching lines @@
         'builder.cc',
         'builder.h',
         'builder_record.cc',
         'builder_record.h',
         'c_include_iterator.cc',
         'c_include_iterator.h',
         'command_args.cc',
         'command_check.cc',
         'command_clean.cc',
         'command_desc.cc',
+        'command_format.cc',
         'command_gen.cc',
-        'command_format.cc',
         'command_help.cc',
         'command_ls.cc',
         'command_refs.cc',
         'commands.cc',
         'commands.h',
         'config.cc',
         'config.h',
         'config_values.cc',
         'config_values.h',
         'config_values_extractors.cc',
         'config_values_extractors.h',
         'config_values_generator.cc',
         'config_values_generator.h',
         'copy_target_generator.cc',
         'copy_target_generator.h',
         'deps_iterator.cc',
         'deps_iterator.h',
         'err.cc',
         'err.h',
         'escape.cc',
         'escape.h',
+        'exec_process.cc',
         'exec_process.h',
-        'exec_process.cc',
         'filesystem_utils.cc',
         'filesystem_utils.h',
-        'functions_target.cc',
-        'functions.cc',
-        'functions.h',
         'function_exec_script.cc',
         'function_foreach.cc',
         'function_get_label_info.cc',
         'function_get_path_info.cc',
         'function_get_target_outputs.cc',
         'function_process_file_template.cc',
         'function_read_file.cc',
         'function_rebase_path.cc',
         'function_set_default_toolchain.cc',
         'function_set_defaults.cc',
         'function_template.cc',
         'function_toolchain.cc',
         'function_write_file.cc',
+        'functions.cc',
+        'functions.h',
+        'functions_target.cc',
         'group_target_generator.cc',
         'group_target_generator.h',
         'header_checker.cc',
         'header_checker.h',
         'import_manager.cc',
         'import_manager.h',
         'input_conversion.cc',
         'input_conversion.h',
         'input_file.cc',
         'input_file.h',
@@ skipping 13 matching lines @@
         'ninja_action_target_writer.cc',
         'ninja_action_target_writer.h',
         'ninja_binary_target_writer.cc',
         'ninja_binary_target_writer.h',
         'ninja_build_writer.cc',
         'ninja_build_writer.h',
         'ninja_copy_target_writer.cc',
         'ninja_copy_target_writer.h',
         'ninja_group_target_writer.cc',
         'ninja_group_target_writer.h',
-        'ninja_utils.cc',
-        'ninja_utils.h',
         'ninja_target_writer.cc',
         'ninja_target_writer.h',
         'ninja_toolchain_writer.cc',
         'ninja_toolchain_writer.h',
+        'ninja_utils.cc',
+        'ninja_utils.h',
         'ninja_writer.cc',
         'ninja_writer.h',
         'operators.cc',
         'operators.h',
         'output_file.cc',
         'output_file.h',
         'parse_tree.cc',
         'parse_tree.h',
         'parser.cc',
         'parser.h',
@@ skipping 38 matching lines @@
         'template.cc',
         'template.h',
         'token.cc',
         'token.h',
         'tokenizer.cc',
         'tokenizer.h',
         'tool.cc',
         'tool.h',
         'toolchain.cc',
         'toolchain.h',
-        'unique_vector.h',
         'trace.cc',
         'trace.h',
+        'unique_vector.h',
         'value.cc',
         'value.h',
         'value_extractors.cc',
         'value_extractors.h',
         'variables.cc',
         'variables.h',
         'visibility.cc',
         'visibility.h',
       ],
     },
@@ skipping 74 matching lines @@
       'type': 'executable',
       'sources': [
         'generate_test_gn_data.cc',
       ],
       'dependencies': [
         '../../base/base.gyp:base',
       ],
     }
   ],
 }