android_webview: stop using system expat.

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 1772 matching lines @@
 
         'p2p_apis%' : 0,
 
         'gtest_target_type%': 'shared_library',
 
         # Uses system APIs for decoding audio and video.
         'use_libffmpeg%': '0',
 
         # When building as part of the Android system, use system libraries
         # where possible to reduce ROM size.
-        # TODO(steveblock): Investigate using the system version of sqlite.
-        'use_system_sqlite%': 0,  # '<(android_webview_build)',
-        'use_system_expat%': '<(android_webview_build)',
         'use_system_icu%': '<(android_webview_build)',
         'use_system_stlport%': '<(android_webview_build)',
 
         # Copy it out one scope.
         'android_webview_build%': '<(android_webview_build)',
 
         # Default android linker script for shared library exports.
         'android_linker_script%': '<(SHARED_INTERMEDIATE_DIR)/android_exports.lst',
       }],  # OS=="android"
       ['embedded==1', {
@@ skipping 3960 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',
   },
 }