Clear the PrintContext in WebLocalFrameImpl::Close().

third_party/WebKit/Source/core/layout/LayoutTreeAsText.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 800 matching lines @@
                               LayoutAsTextBehavior behavior,
                               const PaintLayer* marked_layer) {
   if (!(behavior & kLayoutAsTextDontUpdateLayout))
     frame->GetDocument()->UpdateStyleAndLayout();
 
   LayoutObject* layout_object = frame->ContentLayoutObject();
   if (!layout_object || !layout_object->IsBox())
     return String();
 
   PrintContext print_context(frame);
-  if (behavior & kLayoutAsTextPrintingMode) {
+  bool is_text_printing_mode = !!(behavior & kLayoutAsTextPrintingMode);
+  if (is_text_printing_mode) {
     FloatSize size(ToLayoutBox(layout_object)->Size());
     print_context.BeginPrintMode(size.Width(), size.Height());
   }
 
-  return ExternalRepresentation(ToLayoutBox(layout_object), behavior,
-                                marked_layer);
+  String representation = ExternalRepresentation(ToLayoutBox(layout_object),
+                                                 behavior, marked_layer);
+  if (is_text_printing_mode)
+    print_context.EndPrintMode();
+  return representation;
 }
 
 String ExternalRepresentation(Element* element, LayoutAsTextBehavior behavior) {
   // Doesn't support printing mode.
   DCHECK(!(behavior & kLayoutAsTextPrintingMode));
   if (!(behavior & kLayoutAsTextDontUpdateLayout))
     element->GetDocument().UpdateStyleAndLayout();
 
   LayoutObject* layout_object = element->GetLayoutObject();
   if (!layout_object || !layout_object->IsBox())
@@ skipping 36 matching lines @@
   element->GetDocument().UpdateStyleAndLayout();
 
   LayoutObject* layout_object = element->GetLayoutObject();
   if (!layout_object || !layout_object->IsListItem())
     return String();
 
   return ToLayoutListItem(layout_object)->MarkerText();
 }
 
 }  // namespace blink