Remove the unused helper apps on OS X.

chrome/chrome_exe.gypi

 # Copyright (c) 2012 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.
 
 {
   'targets': [
     {
       'target_name': 'chrome',
       'type': 'none',
       'dependencies': [ 'chrome_initial', ],
@@ skipping 348 matching lines @@
               'postbuild_name': 'Clean up old versions',
               'action': [
                 'tools/build/mac/clean_up_old_versions',
                 '<(version_full)'
               ],
             },
             {
               # This postbuid step is responsible for creating the following
               # helpers:
               #
-              # For unofficial Chromium branding, Chromium Helper EH.app and
-              # Chromium Helper NP.app are created from Chromium Helper.app.
-              # For official Google Chrome branding, Google Chrome Helper
-              # EH.app and Google Chrome Helper NP.app are created from
-              # Google Chrome Helper.app.
-              #
-              # The EH helper is marked for an executable heap. The NP helper
-              # is marked for no PIE (ASLR).
+              # Currently no helpers are produced (crbug.com/520680), but
+              # more will be added soon (crbug.com/497190).
               #
               # Normally, applications shipping as part of offical builds with
               # Google Chrome branding have dsymutil (dwarf-with-dsym,
               # mac_real_dsym) and dump_syms (mac_breakpad) run on them to
               # produce a .dSYM bundle and a Breakpad .sym file. This is
               # unnecessary for the "More Helpers" because they're identical
               # to the original helper except for the bits in their Mach-O
               # headers that change to enable or disable special features.
               # Each .dSYM is identified by UUID stored in a Mach-O file's
               # LC_UUID load command. Because the "More Helpers" share a UUID
@@ skipping 281 matching lines @@
               'dependencies': [
                 'chrome_nacl_win64',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }