Add -bootclasspath argument to javac.

build/android/tests/multiple_proguards/multiple_proguards.gyp

-# Copyright (c) 2013 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.
-{
-  'variables': {
-    'chromium_code': 1,
-  },
-  'targets': [
-    {
-      'target_name': 'multiple_proguards_test_apk',
-      'type': 'none',
-      'variables': {
-        'app_manifest_version_name%': '<(android_app_version_name)',
-        'java_in_dir': '.',
-        'proguard_enabled': 'true',
-        'proguard_flags_paths': [
-          # Both these proguard?.flags files need to be part of the build to
-          # remove both warnings from the src/dummy/DummyActivity.java file, else the
-          # build will fail.
-          'proguard1.flags',
-          'proguard2.flags',
-        ],
-        'R_package': 'dummy',
-        'R_package_relpath': 'dummy',
-        'apk_name': 'MultipleProguards',
-        # This is a build-only test. There's nothing to install.
-        'gyp_managed_install': 0,
-        # The Java code produces warnings, so force the build to not show them.
-        'chromium_code': 0,
-      },
-      'includes': [ '../../../../build/java_apk.gypi' ],
-    },
-  ],
-}