Android: Treat third_party/junit as prebuilt

third_party/junit/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/android/rules.gni")
 
 java_library("junit") {
   chromium_code = false
   testonly = true
   supports_android = true
@@ skipping 191 matching lines @@
     "src/src/main/java/org/junit/runners/parameterized/BlockJUnit4ClassRunnerWithParametersFactory.java",
     "src/src/main/java/org/junit/runners/parameterized/ParametersRunnerFactory.java",
     "src/src/main/java/org/junit/runners/parameterized/TestWithParameters.java",
     "src/src/main/java/org/junit/validator/AnnotationValidator.java",
     "src/src/main/java/org/junit/validator/AnnotationValidatorFactory.java",
     "src/src/main/java/org/junit/validator/AnnotationsValidator.java",
     "src/src/main/java/org/junit/validator/PublicClassValidator.java",
     "src/src/main/java/org/junit/validator/TestClassValidator.java",
     "src/src/main/java/org/junit/validator/ValidateWith.java",
   ]
+
+  # Work-around for combined android projects not having java.lang.management.
+  gradle_treat_as_prebuilt = true
 }