Remove stray comment about ConvertableToTraceFormat

Source/core/rendering/RenderObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1612 matching lines @@
         return false; // Don't invalidate paints if we're printing.
 
     const LayoutRect& newBounds = previousPaintInvalidationRect();
     const LayoutPoint& newLocation = previousPositionFromPaintInvalidationContainer();
 
     // FIXME: PaintInvalidationState should not be required here, but the call to flipForWritingMode
     // in mapRectToPaintInvalidationBacking will give us the wrong results with it disabled.
     // crbug.com/393762
     ASSERT(newBounds == boundsRectForPaintInvalidation(&paintInvalidationContainer, &paintInvalidationState));
 
-    // FIXME: This should use a ConvertableToTraceFormat when they are available in Blink.
     TRACE_EVENT2(TRACE_DISABLED_BY_DEFAULT("blink.invalidation"), "RenderObject::invalidatePaintIfNeeded()",
         "object", this->debugName().ascii(),
         "info", jsonObjectForOldAndNewRects(oldBounds, newBounds));
 
     InvalidationReason invalidationReason = getPaintInvalidationReason(paintInvalidationContainer, oldBounds, oldLocation, newBounds, newLocation);
 
     if (invalidationReason == InvalidationNone)
         return false;
 
     if (invalidationReason == InvalidationIncremental) {
@@ skipping 1804 matching lines @@
 {
     if (object1) {
         const blink::RenderObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showRenderTreeAndMark(object1, "*", object2, "-", 0);
     }
 }
 
 #endif