rlz: Hook up on mac, switch to chrome's network stack on win.

build/common.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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 1041 matching lines @@
       'browser/resources/default_apps/gmail.crx',
       'browser/resources/default_apps/search.crx',
       'browser/resources/default_apps/youtube.crx',
     ],
     'default_apps_list_linux_dest': [
       '<(PRODUCT_DIR)/default_apps/external_extensions.json',
       '<(PRODUCT_DIR)/default_apps/gmail.crx',
       '<(PRODUCT_DIR)/default_apps/search.crx',
       '<(PRODUCT_DIR)/default_apps/youtube.crx',
     ],
+
+     # Force rlz to use chrome's networking stack.
+    'rlz_use_chrome_net%': 1,
   },
   'target_defaults': {
     'variables': {
       # The condition that operates on chromium_code is in a target_conditions
       # section, and will not have access to the default fallback value of
       # chromium_code at the top of this file, or to the chromium_code
       # variable placed at the root variables scope of .gyp files, because
       # those variables are not set at target scope.  As a workaround,
       # if chromium_code is not set at target scope, define it in target scope
       # to contain whatever value it has during early variable expansion.
@@ skipping 1871 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }