Never run errorprone on non-Chromium code.

build/java_apk.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 is meant to be included into a target to provide a rule
 # to build Android APKs in a consistent manner.
 #
 # To use this, create a gyp target with the following form:
 # {
 #   'target_name': 'my_package_apk',
@@ skipping 205 matching lines @@
     'unsigned_apk_path': '<(unsigned_apk_path)',
     'unsigned_abi_split_apk_path': '<(unsigned_abi_split_apk_path)',
     'create_abi_split%': '<(create_abi_split)',
     'managed_input_apk_path': '<(managed_input_apk_path)',
     'libchromium_android_linker': 'libchromium_android_linker.>(android_product_extension)',
     'extra_native_libs': [],
     'native_lib_placeholder_stamp': '<(apk_package_native_libs_dir)/<(android_app_abi)/native_lib_placeholder.stamp',
     'native_lib_placeholders': [],
     'main_apk_name': '<(apk_name)',
     'dex_path': '<(dex_path)',
-    'enable_errorprone%': '0',
+    'conditions': [
+      ['chromium_code == 0', {
+        'enable_errorprone': 0,
+      }],
+    ],
+    'enable_errorprone%': 0,
     'errorprone_exe_path': '<(PRODUCT_DIR)/bin.java/chromium_errorprone',
   },
   # Pass the jar path to the apk's "fake" jar target.  This would be better as
   # direct_dependent_settings, but a variable set by a direct_dependent_settings
   # cannot be lifted in a dependent to all_dependent_settings.
   'all_dependent_settings': {
     'conditions': [
       ['proguard_enabled == "true"', {
         'variables': {
           'proguard_enabled': 'true',
@@ skipping 873 matching lines @@
             'native_libs_dir': '<(apk_package_native_libs_dir)',
           }, {
             'native_libs_dir': '<(DEPTH)/build/android/ant/empty/res',
           }],
         ],
       },
       'includes': ['android/apkbuilder_action.gypi'],
     },
   ],
 }