Remove BrowserPlugin tests (only one test remaining with existing coverage)

content/content_tests.gypi

 # 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': {
     'layouttest_support_content_sources': [
       'public/test/layouttest_support.h',
       'public/test/nested_message_pump_android.cc',
       'public/test/nested_message_pump_android.h',
@@ skipping 1203 matching lines @@
             'browser/tracing/tracing_controller_browsertest.cc',
             'browser/transition_browsertest.cc',
             'browser/web_contents/opened_by_dom_browsertest.cc',
             'browser/web_contents/touch_editable_impl_aura_browsertest.cc',
             'browser/web_contents/web_contents_impl_browsertest.cc',
             'browser/web_contents/web_contents_view_aura_browsertest.cc',
             'browser/webkit_browsertest.cc',
             'browser/webui/web_ui_mojo_browsertest.cc',
             'child/site_isolation_policy_browsertest.cc',
             'renderer/accessibility/renderer_accessibility_browsertest.cc',
-            'renderer/browser_plugin/browser_plugin_browsertest.cc',
-            'renderer/browser_plugin/browser_plugin_browsertest.h',
-            'renderer/browser_plugin/mock_browser_plugin.cc',
-            'renderer/browser_plugin/mock_browser_plugin.h',
-            'renderer/browser_plugin/mock_browser_plugin_manager.cc',
-            'renderer/browser_plugin/mock_browser_plugin_manager.h',
             'renderer/browser_render_view_browsertest.cc',
             'renderer/dom_serializer_browsertest.cc',
             'renderer/gin_browsertest.cc',
             'renderer/mouse_lock_dispatcher_browsertest.cc',
             'renderer/pepper/fake_pepper_plugin_instance.cc',
             'renderer/pepper/mock_renderer_ppapi_host.cc',
             'renderer/pepper/pepper_device_enumeration_host_helper_unittest.cc',
             'renderer/pepper/pepper_file_chooser_host_unittest.cc',
             'renderer/pepper/pepper_graphics_2d_host_unittest.cc',
             'renderer/pepper/pepper_url_request_unittest.cc',
@@ skipping 687 matching lines @@
                   'files': ['<(PRODUCT_DIR)/libnpapi_test_plugin.so'],
                 },
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }