Follow-on fixes and naming changes for https://codereview.chromium.org/12086077/

BUG=172573
Review URL: https://codereview.chromium.org/12177018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@180600 0039d316-1c4b-4281-b951-d872f2087c98
  OpenChannelToNpapiPluginCallback(RenderMessageFilter* filter,
                                   ResourceContext* context,
                                   IPC::Message* reply_msg)
      : RenderMessageCompletionCallback(filter, reply_msg),
        context_(context),
        host_(NULL),
        sent_plugin_channel_request_(false) {
  }

  OpenChannelToNpapiPluginCallback(RenderMessageFilter* filter,
                                   ResourceContext* context,
                                   IPC::Message* reply_msg)
      : RenderMessageCompletionCallback(filter, reply_msg),
        context_(context),
        host_(NULL),
        sent_plugin_channel_request_(false) {
  }
