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

content/content_renderer.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.
 
 {
   'dependencies': [
     'content_common_mojo_bindings',
     '../base/base.gyp:base',
     '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
     '../cc/cc.gyp:cc',
@@ skipping 86 matching lines @@
       'renderer/android/phone_number_detector.cc',
       'renderer/android/phone_number_detector.h',
       'renderer/android/renderer_date_time_picker.cc',
       'renderer/android/renderer_date_time_picker.h',
       'renderer/android/synchronous_compositor_factory.cc',
       'renderer/android/synchronous_compositor_factory.h',
       'renderer/battery_status/battery_status_dispatcher.cc',
       'renderer/battery_status/battery_status_dispatcher.h',
       'renderer/browser_plugin/browser_plugin.cc',
       'renderer/browser_plugin/browser_plugin.h',
-      'renderer/browser_plugin/browser_plugin_manager_factory.h',
-      'renderer/browser_plugin/browser_plugin_manager_impl.cc',
-      'renderer/browser_plugin/browser_plugin_manager_impl.h',
       'renderer/browser_plugin/browser_plugin_manager.cc',
       'renderer/browser_plugin/browser_plugin_manager.h',
       'renderer/clipboard_utils.cc',
       'renderer/clipboard_utils.h',
       'renderer/child_frame_compositing_helper.cc',
       'renderer/child_frame_compositing_helper.h',
       'renderer/chrome_object_extensions_utils.cc',
       'renderer/chrome_object_extensions_utils.h',
       'renderer/context_menu_params_builder.cc',
       'renderer/context_menu_params_builder.h',
@@ skipping 717 matching lines @@
     }],
   ],
   'target_conditions': [
     ['OS=="android"', {
       'sources/': [
         ['include', '^renderer/render_view_linux\\.cc$'],
       ],
     }],
   ],
 }