Rework build/mac/tweak_info_plist.py to not rely on environment variables.

chrome/chrome_dll_bundle.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.
 
 # This file contains resources for the main Mac chromium bundle.
 {
   # The main browser executable's name is <(mac_product_name).
   # Certain things will get confused if two modules in the
   # executable share the same name, so append " Framework" to the
   # product_name used for the framework.  This will result in
@@ skipping 96 matching lines @@
     {
       # Modify the Info.plist as needed.  The script explains why
       # this is needed.  This is also done in the chrome target.
       # The framework needs the Breakpad keys if this feature is
       # enabled.  It does not need the Keystone keys; these always
       # come from the outer application bundle.  The framework
       # doesn't currently use the SCM keys for anything,
       # but this seems like a really good place to store them.
       'postbuild_name': 'Tweak Info.plist',
       'action': ['<(tweak_info_plist_path)',
+                 '--plist=${TARGET_BUILD_DIR}/${INFOPLIST_PATH}',
                  '--breakpad=<(mac_breakpad_compiled_in)',
                  '--breakpad_uploads=<(mac_breakpad_uploads)',
                  '--keystone=0',
                  '--scm=1',
                  '--branding=<(branding)'],
     },
   ],
   'copies': [
     {
       'destination': '<(PRODUCT_DIR)/$(CONTENTS_FOLDER_PATH)/Helpers',
@@ skipping 147 matching lines @@
       ],
     }],
     ['v8_use_external_startup_data==1', {
       'mac_bundle_resources': [
         '<(PRODUCT_DIR)/natives_blob.bin',
         '<(PRODUCT_DIR)/snapshot_blob.bin',
       ],
     }],
   ],  # conditions
 }