Issue 119 - Switch to injecting CSS for element hiding

src/plugin/PluginClass.cpp

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 280 matching lines @@
     {
       DEBUG_GENERAL([this]() -> std::wstring
       {
         std::wstringstream ss;
         ss << L"CPluginClass::SetSite, this = " << ToHexLiteral(this);
         ss << L", browser = nullptr";
         return ss.str();
       }());
 
       Unadvise();
+      assert(m_data->connectedWebBrowsersCache.empty() && "Connected web browser cache should be already empty");
 
       // Destroy window
       if (m_pWndProcStatus)
       {
         ::SetWindowLongPtr(m_hStatusBarWnd, GWLP_WNDPROC, (LPARAM)(WNDPROC)m_pWndProcStatus);
 
         m_pWndProcStatus = NULL;
       }
 
       if (m_hPaneWnd)
@@ skipping 1414 matching lines @@
   s_criticalSectionLocal.Unlock();
 
   return icon;
 }
 
 ATOM CPluginClass::GetAtomPaneClass()
 {
   return s_atomPaneClass;
 }