Use the system zlib and ICU when building with the Android build system

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 933 matching lines @@
         ### 'gtest_target_type': 'shared_libary',
 
         # Uses system APIs for decoding audio and video.
         'use_libffmpeg%': '0',
 
         # Always use the chromium skia. The use_system_harfbuzz needs to
         # match use_system_skia.
         'use_system_skia%': '0',
         'use_system_harfbuzz%': '0',
 
-        # Use the system icu.
-        'use_system_icu%': 0,
-
         # TODO(yfriedman): Remove once unit_tests can link for Android.
         # To override it specify:
         # GYP_DEFINES="$GYP_DEFINES android_unit_test_target_type=executable"
         #     android_gyp
         'android_unit_test_target_type%': 'static_library',
 
-        'conditions': [
-          # Choose static link by build type.
-          ['android_build_type==0', {
-            'static_link_system_icu%': 1,
-          }, {
-            'static_link_system_icu%': 0,
-          }],
-        ],
+        # Always use the system zlib.
+        'use_system_zlib%': 1,
+
         # TODO(steveblock): Investigate using the system versions of sqlite and
         # libjpeg.
         # Enable to use system sqlite.
         'use_system_sqlite%': 0,  # '<(android_build_type)',
         # Enable to use system libjpeg.
         'use_system_libjpeg%': 0,  # '<(android_build_type)',
         # Enable to use the system expat.
         'use_system_expat%': '<(android_build_type)',
         # Enable to use the system stlport, otherwise statically
         # link the NDK one?
         'use_system_stlport%': '<(android_build_type)',
+        # Enable to use the system ICU.
+        'use_system_icu%': '<(android_build_type)',
         # Copy it out one scope.
         'android_build_type%': '<(android_build_type)',
       }],  # OS=="android"
       ['OS=="mac"', {
         # Enable clang on mac by default!
         'clang%': 1,
         # Compile in Breakpad support by default so that it can be
         # tested, even if it is not enabled by default at runtime.
         'mac_breakpad_compiled_in%': 1,
         'conditions': [
@@ skipping 2304 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',
   },
 }