NOCOMMIT: Blink tracing now uses base

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

Index: third_party/WebKit/Source/core/layout/TracedLayoutObject.cpp
diff --git a/third_party/WebKit/Source/core/layout/TracedLayoutObject.cpp b/third_party/WebKit/Source/core/layout/TracedLayoutObject.cpp
index ee60df3dcdedfef88bb996b50d8a887137531a8c..14c8e5eb6daaa46572c846a92c06243bfcadd600 100644
--- a/third_party/WebKit/Source/core/layout/TracedLayoutObject.cpp
+++ b/third_party/WebKit/Source/core/layout/TracedLayoutObject.cpp
@@ -13,17 +13,17 @@
 
 namespace blink {
 
-PassRefPtr<TraceEvent::ConvertableToTraceFormat> TracedLayoutObject::create(const LayoutView& view, bool traceGeometry)
+scoped_refptr<base::trace_event::ConvertableToTraceFormat> TracedLayoutObject::create(const LayoutView& view, bool traceGeometry)
 {
-    return adoptRef(new TracedLayoutObject(view, traceGeometry));
+    return new TracedLayoutObject(view, traceGeometry);
 }
 
-String TracedLayoutObject::asTraceFormat() const
+void TracedLayoutObject::AppendAsTraceFormat(std::string* out) const
 {
     StringBuilder builder;
     RefPtr<JSONObject> json(toJSON());
     json->writeJSON(&builder);
-    return builder.toString();
+    *out = builder.toString().utf8().data();
 }
 
 TracedLayoutObject::TracedLayoutObject(const LayoutObject& object, bool traceGeometry)
@@ -80,7 +80,7 @@ TracedLayoutObject::TracedLayoutObject(const LayoutObject& object, bool traceGeo
     }
 
     for (LayoutObject* child = object.slowFirstChild(); child; child = child->nextSibling()) {
-        m_children.append(adoptRef(new TracedLayoutObject(*child, traceGeometry)));
+        m_children.append(new TracedLayoutObject(*child, traceGeometry));
     }
 }