Blink: Replace all "plug-in" with "plugin".

Source/core/dom/DOMImplementation.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig (sam@webkit.org)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 337 matching lines @@
     if ((type == "application/pdf" || type == "text/pdf") && pluginData && pluginData->supportsMimeType(type))
         return PluginDocument::create(init);
     if (Image::supportsType(type))
         return ImageDocument::create(init);
 
     // Check to see if the type can be played by our media player, if so create a MediaDocument
     if (HTMLMediaElement::supportsType(ContentType(type)))
         return MediaDocument::create(init);
 
     // Everything else except text/plain can be overridden by plugins. In particular, Adobe SVG Viewer should be used for SVG, if installed.
-    // Disallowing plug-ins to use text/plain prevents plug-ins from hijacking a fundamental type that the browser is expected to handle,
-    // and also serves as an optimization to prevent loading the plug-in database in the common case.
+    // Disallowing plugins to use text/plain prevents plugins from hijacking a fundamental type that the browser is expected to handle,
+    // and also serves as an optimization to prevent loading the plugin database in the common case.
     if (type != "text/plain" && pluginData && pluginData->supportsMimeType(type))
         return PluginDocument::create(init);
     if (isTextMIMEType(type))
         return TextDocument::create(init);
     if (type == "image/svg+xml")
         return XMLDocument::createSVG(init);
     if (isXMLMIMEType(type))
         return XMLDocument::create(init);
 
     return HTMLDocument::create(init);
 }
 
 DEFINE_TRACE(DOMImplementation)
 {
     visitor->trace(m_document);
 }
 
 }