Remove unused variable ios_mac_build

build/ios/mac_build.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.
 
 # Xcode throws an error if an iOS target depends on a Mac OS X target. So
 # any place a utility program needs to be build and run, an action is
 # used to run ninja as script to work around this.
 # Example:
 # {
 #   'target_name': 'foo',
@@ skipping 49 matching lines @@
       'build/gyp_chromium',
       '--depth=.',
       # Don't use anything set for the iOS side of things.
       '--ignore-environment',
       # Generate for ninja
       '--format=ninja',
       # Generate files into xcodebuild/ninja
       '-Goutput_dir=xcodebuild/<(ninja_output_dir)',
       # nacl isn't in the iOS checkout, make sure it's turned off
       '-Ddisable_nacl=1',
-      # Add a variable to handle specific cases for mac_build.
-      '-Dios_mac_build=1',

[justincohen, 2014/09/15 13:44:51]

Do you know where we ever used this? 

[sdefresne, 2014/09/15 15:16:29]

It was never used not even in the CL that introduced it. It's been removed
downstream so I think it is unnecessary.

       # Pass through the Mac SDK version.
       '-Dmac_sdk=<(mac_sdk)',
       '-Dparent_generator=<(parent_generator)'
     ],
 
     # Rerun gyp for each of the projects needed. This is what actually
     # generates the projects on disk.
     're_run_gyp_execution':
       '<!(cd <(DEPTH) && <@(re_run_gyp) <@(re_run_targets))',
   },
   # Since these are used to generate things needed by other targets, make
   # them hard dependencies so they are always built first.
   'hard_dependency': 1,
 }