Closure: remove older, original GYP compilation system

third_party/closure_compiler/compile_js2.gypi

 # Copyright 2015 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.
 {
   'type': 'none',
 
   'variables': {
     'CLOSURE_DIR': '<(DEPTH)/third_party/closure_compiler',
     'EXTERNS_GYP': '<(CLOSURE_DIR)/externs/compiled_resources2.gyp',
     'INTERFACES_GYP': '<(CLOSURE_DIR)/interfaces/compiled_resources2.gyp',
@@ skipping 14 matching lines @@
   'actions': [
     {
       'action_name': 'compile_js',
 
       # This action optionally takes these arguments:
       # - sources: a list of all of the source files to be compiled.
       #            If sources is undefined, a default of ['<(_target_name).js']
       #            is created (this probably suffices for many targets).
       # - out_file: a file where the compiled output is written to. The default
       #             is gen/closure/<path to |target_name|>/|target_name|.js.
-      # - script_args: additional arguments to pass to compile.py.
+      # - script_args: additional arguments to pass to compile2.py.
       # - closure_args: additional arguments to pass to the Closure compiler.
       # - disabled_closure_args: additional arguments dealing with the
       #                          strictness of compilation; Non-strict
       #                          defaults are provided that can be overriden.
       'variables': {
         'target_path': '<!(python <(CLOSURE_DIR)/build/outputs.py <(default_source_file))',
         'out_file%': '<(SHARED_INTERMEDIATE_DIR)/closure/<(target_path)',
         # TODO(dbeam): remove when no longer used from remoting/.
         'script_args%': [],
         'closure_args%': '<(default_closure_args)',
@@ skipping 23 matching lines @@
         '>@(_sources)',
         '--out_file', '<(out_file)',
         '--closure_args', '<@(closure_args)', '<@(disabled_closure_args)',
         # '--verbose' # for make glorious log spam of Closure compiler.
       ],
 
       'message': 'Compiling <(target_path)',
     },
   ],
 }