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

Source/core/paint/PartPainter.cpp

 // 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.
 
 #include "config.h"
 #include "core/paint/PartPainter.h"
 
 #include "core/layout/LayoutPart.h"
 #include "core/layout/PaintInfo.h"
 #include "core/paint/BoxPainter.h"
@@ skipping 71 matching lines @@
 
     // Tell the widget to paint now. This is the only time the widget is allowed
     // to paint itself. That way it will composite properly with z-indexed layers.
     IntPoint widgetLocation = widget->frameRect().location();
     IntPoint paintLocation(roundToInt(adjustedPaintOffset.x() + m_layoutPart.borderLeft() + m_layoutPart.paddingLeft()),
         roundToInt(adjustedPaintOffset.y() + m_layoutPart.borderTop() + m_layoutPart.paddingTop()));
     IntRect paintRect = paintInfo.rect;
 
     IntSize widgetPaintOffset = paintLocation - widgetLocation;
     // When painting widgets into compositing layers, tx and ty are relative to the enclosing compositing layer,
-    // not the root. In this case, shift the CTM and adjust the paintRect to be root-relative to fix plug-in drawing.
+    // not the root. In this case, shift the CTM and adjust the paintRect to be root-relative to fix plugin drawing.
     TransformRecorder transform(*paintInfo.context, m_layoutPart.displayItemClient(),
         AffineTransform::translation(widgetPaintOffset.width(), widgetPaintOffset.height()));
     paintRect.move(-widgetPaintOffset);
     widget->paint(paintInfo.context, paintRect);
 }
 
 } // namespace blink