Revert of Remove NPAPI plugin from chromoting webapp.

remoting/remoting_webapp.gypi

 # 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.
 #
 # File included in remoting_webapp_* targets in remoting_client.gypi
 
 {
   'type': 'none',
   'variables': {
+    'include_host_plugin%': 0,
     'extra_files%': [],
     'generated_html_files': [
       '<(SHARED_INTERMEDIATE_DIR)/main.html',
       '<(SHARED_INTERMEDIATE_DIR)/wcs_sandbox.html',
     ],
   },
   'dependencies': [
     'remoting_resources',
     'remoting_webapp_html',
   ],
   'conditions': [
+    ['include_host_plugin==1', {
+      'dependencies': [
+        'remoting_host_plugin',
+      ],
+      'variables': {
+        'plugin_path': '<(PRODUCT_DIR)/<(host_plugin_prefix)remoting_host_plugin.<(host_plugin_extension)',
+        'plugin_args': [
+          '--locales', '<@(remoting_host_locale_files)',
+          '--plugin', '<(plugin_path)',
+        ],
+      },
+    }, {
+      'variables': {
+        'plugin_args': [],
+      },
+    }],
     ['webapp_type=="v2_pnacl"', {
       'dependencies': [
         'remoting_nacl.gyp:remoting_client_plugin_nacl',
       ],
       'variables': {
         'extra_files': [
           'webapp/remoting_client_pnacl.nmf',
           '<(PRODUCT_DIR)/remoting_client_plugin_newlib.pexe',
         ],
       },
@@ skipping 28 matching lines @@
       'inputs': [
         'webapp/build-webapp.py',
         'webapp/manifest.json.jinja2',
         '<(chrome_version_path)',
         '<(remoting_version_path)',
         '<@(generated_html_files)',
         '<@(remoting_webapp_files)',
         '<@(remoting_webapp_locale_files)',
         '<@(extra_files)',
       ],
+      'conditions': [
+        ['include_host_plugin==1', {
+          'inputs': [
+            '<(plugin_path)',
+            '<@(remoting_host_locale_files)',
+          ],
+        }],
+      ],
       'outputs': [
         '<(output_dir)',
         '<(zip_path)',
       ],
       'action': [
         'python', 'webapp/build-webapp.py',
         '<(buildtype)',
         '<(version_full)',
+        '<(host_plugin_mime_type)',
         '<(output_dir)',
         '<(zip_path)',
         'webapp/manifest.json.jinja2',
         '<(webapp_type)',
         '<@(generated_html_files)',
         '<@(remoting_webapp_files)',
         '<@(extra_files)',
+        '<@(plugin_args)',
         '--locales', '<@(remoting_webapp_locale_files)',
       ],
     },
   ],
 }