Remove GYP annotations from third_party GN files.

third_party/WebKit/Source/bindings/scripts/BUILD.gn

 # 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/bindings.gni")
 import("//third_party/WebKit/Source/bindings/scripts/scripts.gni")
 import("//third_party/WebKit/Source/bindings/templates/templates.gni")
 
 visibility = [ "//third_party/WebKit/*" ]
 
 # This separate pre-caching step is required to use lex/parse table
 # caching in PLY, since PLY itself does not check if the cache is
 # valid, and thus may end up using a stale cache if this step hasn't
 # been run to update it.
 #
 # This action's dependencies *is* the cache validation.
-#
-# GYP version: scripts.gyp:cached_lex_yacc_tables
 action("cached_lex_yacc_tables") {
   script = "blink_idl_parser.py"
 
   inputs = idl_lexer_parser_files
   outputs = [
     "$bindings_scripts_output_dir/lextab.py",
     "$bindings_scripts_output_dir/parsetab.pickle",
   ]
 
   args = [ rebase_path(bindings_scripts_output_dir, root_build_dir) ]
 }
 
 # A separate pre-caching step is *required* to use bytecode caching in
 # Jinja (which improves speed significantly), as the bytecode cache is
 # not concurrency-safe on write; details in code_generator_v8.py.
-#
-# GYP version: scripts.gyp:cached_jinja_templates
 action("cached_jinja_templates") {
   script = "code_generator_v8.py"
 
   inputs = jinja_module_files + [ "code_generator_v8.py" ] +
            code_generator_template_files
 
   # Dummy file to track dependency.
   stamp_file = "$bindings_scripts_output_dir/cached_jinja_templates.stamp"
   outputs = [
     stamp_file,
   ]
 
   args = [
     rebase_path(bindings_scripts_output_dir, root_build_dir),
     rebase_path(stamp_file, root_build_dir),
   ]
 }