Use third_party/custom_tabs_client as the src for customtabs library

chrome/android/chrome_apk.gyp

 # Copyright 2015 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.
 {
   'includes': [
     '../../chrome/chrome_android_paks.gypi', # Included for the list of pak resources.
     '../../build/util/version.gypi'
    ],
   'variables': {
     'chromium_code': 1,
     'package_name': 'chrome_public_apk',
     'manifest_package': 'org.chromium.chrome',
     'chrome_public_apk_manifest': '<(SHARED_INTERMEDIATE_DIR)/chrome_public_apk_manifest/AndroidManifest.xml',
     'chrome_public_test_apk_manifest': '<(SHARED_INTERMEDIATE_DIR)/chrome_public_test_apk_manifest/AndroidManifest.xml',
     # This list is shared with GN.
     # Defines a list of source files should be present in the open-source
     # chrome-apk but not in the published static_library which is included in the
     # real chrome for android.
     'chrome_public_app_native_sources': [
       '../browser/android/chrome_entry_point.cc',
       '../browser/android/chrome_main_delegate_staging_android_initializer.cc',
     ],
   },
   'targets': [
     {
-      #GN: //chrome/android::custom_tabs_service_aidl
-      'target_name': 'custom_tabs_service_aidl',
-      'type': 'none',
-      'variables': {
-        'aidl_interface_file': 'java/src/android/support/customtabs/common.aidl',
-        'aidl_import_include': 'java/src/android/support/customtabs',
-      },
-      'sources': [
-        'java/src/android/support/customtabs/ICustomTabsCallback.aidl',
-        'java/src/android/support/customtabs/ICustomTabsService.aidl',
-      ],
-      'includes': [ '../../build/java_aidl.gypi' ],
-    },
-    {
       # GN: //chrome/android:chrome_public_template_resources
       'target_name': 'chrome_public_template_resources',
       'type': 'none',
       'variables': {
         'jinja_inputs_base_dir': 'java/res_template',
         'jinja_inputs': [
           '<(jinja_inputs_base_dir)/xml/searchable.xml',
           '<(jinja_inputs_base_dir)/xml/syncadapter.xml',
         ],
         'jinja_outputs_zip': '<(PRODUCT_DIR)/res.java/<(_target_name).zip',
@@ skipping 172 matching lines @@
       ],
     },
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: