Remove unused fields from //content.

content/renderer/browser_plugin/browser_plugin.cc

 // Copyright 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.
 
 #include "content/renderer/browser_plugin/browser_plugin.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 50 matching lines @@
   PluginContainerMap::iterator it = browser_plugins->find(container);
   return it == browser_plugins->end() ? nullptr : it->second;
 }
 
 BrowserPlugin::BrowserPlugin(
     RenderFrame* render_frame,
     const base::WeakPtr<BrowserPluginDelegate>& delegate)
     : attached_(false),
       render_frame_routing_id_(render_frame->GetRoutingID()),
       container_(nullptr),
-      sad_guest_(nullptr),
       guest_crashed_(false),
       plugin_focused_(false),
       visible_(true),
       mouse_locked_(false),
       ready_(false),
       browser_plugin_instance_id_(browser_plugin::kInstanceIDNone),
       delegate_(delegate),
       weak_ptr_factory_(this) {
   browser_plugin_instance_id_ =
       BrowserPluginManager::Get()->GetNextInstanceID();
@@ skipping 486 matching lines @@
 
 bool BrowserPlugin::HandleMouseLockedInputEvent(
     const blink::WebMouseEvent& event) {
   BrowserPluginManager::Get()->Send(
       new BrowserPluginHostMsg_HandleInputEvent(browser_plugin_instance_id_,
                                                 &event));
   return true;
 }
 
 }  // namespace content