[Bindings] Remove a redundant option write-file-if-only-changed in bindings

third_party/WebKit/Source/bindings/scripts/utilities.py

 # 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.
 
 """Utility functions (file reading, simple IDL parsing by regexes) for IDL build.
 
 Design doc: http://www.chromium.org/developers/design-documents/idl-build
 """
 
 import os
@@ skipping 285 matching lines @@
         idl_file_names.extend(resolve_cygpath(cygdrive_names))
         return idl_file_names
 
 
 def read_pickle_files(pickle_filenames):
     for pickle_filename in pickle_filenames:
         with open(pickle_filename) as pickle_file:
             yield pickle.load(pickle_file)
 
 
-def write_file(new_text, destination_filename, only_if_changed):
-    if only_if_changed and os.path.isfile(destination_filename):
+def write_file(new_text, destination_filename):
+    # If |new_text| is same with the file content, we skip updating.
+    if os.path.isfile(destination_filename):
         with open(destination_filename) as destination_file:
             if destination_file.read() == new_text:
                 return
+
     destination_dirname = os.path.dirname(destination_filename)
     if not os.path.exists(destination_dirname):
         os.makedirs(destination_dirname)
     with open(destination_filename, 'w') as destination_file:
         destination_file.write(new_text)
 
 
-def write_pickle_file(pickle_filename, data, only_if_changed):
-    if only_if_changed and os.path.isfile(pickle_filename):
+def write_pickle_file(pickle_filename, data):
+    # If |data| is same with the file content, we skip updating.
+    if os.path.isfile(pickle_filename):
         with open(pickle_filename) as pickle_file:
             try:
                 if pickle.load(pickle_file) == data:
                     return
             except Exception:
                 # If trouble unpickling, overwrite
                 pass
     with open(pickle_filename, 'w') as pickle_file:
         pickle.dump(data, pickle_file)
 
@@ skipping 177 matching lines @@
 
         # Remember an open brace.
         match = re_last_brace.search(line)
         was_open_brace = (match and match.group('last') == '{' and 'namespace' not in line)
 
     # Let |'\n'.join| emit the last newline.
     if output:
         output.append('')
 
     return '\n'.join(output)