Delete the NPAPI plugin browsertests.

chrome/browser_tests.isolate

 # 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.
 {
   'conditions': [
     ['use_x11==0', {
       'variables': {
         'command': [
           '../testing/test_env.py',
           '<(PRODUCT_DIR)/browser_tests<(EXECUTABLE_SUFFIX)',
@@ skipping 166 matching lines @@
         ],
       },
     }],
     ['OS=="mac"', {
       'variables': {
         'files': [
           '<(PRODUCT_DIR)/clearkeycdmadapter.plugin',
           '<(PRODUCT_DIR)/content_shell.pak',
           '<(PRODUCT_DIR)/libclearkeycdm.dylib',
           '<(PRODUCT_DIR)/osmesa.so',
-          '<(PRODUCT_DIR)/plugins/npapi_test_plugin.plugin/',
           '<(PRODUCT_DIR)/plugins/test_netscape_plugin.plugin/',
           '<(PRODUCT_DIR)/power_saver_test_plugin.plugin/Contents/MacOS/power_saver_test_plugin',
           '<(PRODUCT_DIR)/ppapi_tests.plugin/Contents/MacOS/ppapi_tests',
         ],
       },
     }],
     ['OS=="mac" and branding=="Chrome" and enable_pepper_cdms==1', {
       'variables': {
         'files': [
           '<(PRODUCT_DIR)/libwidevinecdm.dylib',
@@ skipping 67 matching lines @@
           'browser/chromeos/login/test/https_forwarder.py',
         ],
       },
     }],
   ],
   'includes': [
     '../base/base.isolate',
     'chrome.isolate',
   ],
 }