Remove bzip2 code since it is no longer being used.

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 1120 matching lines @@
             'linux_dump_symbols%': 1,
           }],
         ],
       }],  # os_posix==1 and OS!="mac" and OS!="ios"
       ['OS=="ios"', {
         'disable_nacl%': 1,
         'enable_background%': 0,
         'enable_gpu%': 0,
         'enable_task_manager%': 0,
         'icu_use_data_file_flag%': 1,
-        'use_system_bzip2%': 1,
         'use_system_libxml%': 1,
         'use_system_sqlite%': 1,
         'locales==': [
           'ar', 'ca', 'cs', 'da', 'de', 'el', 'en-GB', 'en-US', 'es', 'fi',
           'fr', 'he', 'hr', 'hu', 'id', 'it', 'ja', 'ko', 'ms', 'nl', 'pl',
           'pt', 'pt-PT', 'ro', 'ru', 'sk', 'sv', 'th', 'tr', 'uk', 'vi',
           'zh-CN', 'zh-TW',
         ],
 
         # The Mac SDK is set for iOS builds and passed through to Mac
@@ skipping 3300 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',
   },
 }