Move ChromeOS/Android checking for legacy protocol to build files.

mojo/mojo_edk.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     'mojo_edk.gypi',
@@ skipping 37 matching lines @@
       'sources': [
         '<@(mojo_edk_system_impl_sources)',
         '<@(mojo_edk_system_impl_non_nacl_sources)',
       ],
       'conditions': [
         ['OS=="android"', {
           'dependencies': [
             '../third_party/ashmem/ashmem.gyp:ashmem',
           ],
         }],
+        ['OS=="android" or chromeos==1', {
+          'defines': [
+            'MOJO_EDK_LEGACY_PROTOCOL',
+          ],
+        }],
         ['OS=="win"', {
            # Structure was padded due to __declspec(align()), which is
            # uninteresting.
           'msvs_disabled_warnings': [ 4324 ],
         }],
         ['OS=="mac" and OS!="ios"', {
           'sources': [
             'edk/system/mach_port_relay.cc',
             'edk/system/mach_port_relay.h',
           ],
@@ skipping 151 matching lines @@
           'configurations': {
             'Common_Base': {
               'msvs_target_platform': 'x64',
             },
           },
         },
       ],
     }],
   ]
 }