Use isolatedCopies for TracedLayoutObject strings

Source/core/layout/TracedLayoutObject.cpp

 // Copyright 2015 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/layout/TracedLayoutObject.h"
 
 #include "core/layout/LayoutInline.h"
 #include "core/layout/LayoutTableCell.h"
 #include "core/layout/LayoutText.h"
@@ skipping 19 matching lines @@
     : m_address((unsigned long) &object)
     , m_isAnonymous(object.isAnonymous())
     , m_isPositioned(object.isOutOfFlowPositioned())
     , m_isRelPositioned(object.isRelPositioned())
     , m_isFloating(object.isFloating())
     , m_selfNeeds(object.selfNeedsLayout())
     , m_positionedMovement(object.needsPositionedMovementLayout())
     , m_childNeeds(object.normalChildNeedsLayout())
     , m_posChildNeeds(object.posChildNeedsLayout())
     , m_isTableCell(object.isTableCell())
-    , m_name(object.name())
+    , m_name(String(object.name()).isolatedCopy())
     , m_absRect(object.absoluteBoundingBoxRect())
 {
     if (Node* node = object.node()) {
-        m_tag = node->nodeName();
+        m_tag = String(node->nodeName()).isolatedCopy();
         if (node->isElementNode()) {
             Element& element = toElement(*node);
             if (element.hasID())
-                m_id = element.getIdAttribute();
+                m_id = String(element.getIdAttribute()).isolatedCopy();
             if (element.hasClass()) {
                 for (size_t i = 0; i < element.classNames().size(); ++i) {
-                    m_classNames.append(element.classNames()[i]);
+                    m_classNames.append(
+                        String(element.classNames()[i]).isolatedCopy());
                 }
             }
         }
     }
 
     // FIXME: When the fixmes in LayoutTreeAsText::writeLayoutObject() are
     // fixed, deduplicate it with this.
     if (object.isText()) {
         m_rect = LayoutRect(toLayoutText(object).linesBoundingBox());
     } else if (object.isLayoutInline()) {
@@ skipping 68 matching lines @@
         RefPtr<JSONArray> children(JSONArray::create());
         for (const auto& child : m_children) {
             children->pushObject(child->toJSON());
         }
         json->setArray("children", children);
     }
     return json.release();
 }
 
 } // namespace blink