NOCOMMIT: Blink tracing now uses base

third_party/WebKit/Source/platform/TracedValue.cpp

Index: third_party/WebKit/Source/platform/TracedValue.cpp
diff --git a/third_party/WebKit/Source/platform/TracedValue.cpp b/third_party/WebKit/Source/platform/TracedValue.cpp
index 96e4010eea705c80a66227f83369063a9e257dbc..f35dfc7b0996223f8a2403bdf4ae05bcbc4a6612 100644
--- a/third_party/WebKit/Source/platform/TracedValue.cpp
+++ b/third_party/WebKit/Source/platform/TracedValue.cpp
@@ -166,9 +166,9 @@ private:
     Vector<String> m_order;
 };
 
-PassRefPtr<TracedValue> TracedValue::create()
+scoped_refptr<TracedValue> TracedValue::create()
 {
-    return adoptRef(new TracedValue());
+    return new TracedValue();
 }
 
 TracedValue::TracedValue()
@@ -263,12 +263,12 @@ void TracedValue::endArray()
     m_stack.removeLast();
 }
 
-String TracedValue::asTraceFormat() const
+void TracedValue::AppendAsTraceFormat(std::string* out) const
 {
     ASSERT(m_stack.size() == 1);
     StringBuilder builder;
     m_stack.first()->toJSON(&builder);
-    return builder.toString();
+    *out = builder.toString().utf8().data();
 }
 
 TracedDictionaryValue* TracedValue::currentDictionary() const