Remove Blink's ConvertableToTraceFormat

third_party/WebKit/Source/platform/TracedValue.h

Index: third_party/WebKit/Source/platform/TracedValue.h
diff --git a/third_party/WebKit/Source/platform/TracedValue.h b/third_party/WebKit/Source/platform/TracedValue.h
index 89b2d6e0905d21aafcee8712d49d9e4217f5183d..85887c4bdee3cb851b102e9ea02aa7ae605c35b0 100644
--- a/third_party/WebKit/Source/platform/TracedValue.h
+++ b/third_party/WebKit/Source/platform/TracedValue.h
@@ -19,10 +19,12 @@ class TracedValue;
 namespace blink {
 
 // TracedValue copies all passed names and values and doesn't retain references.
-class PLATFORM_EXPORT TracedValue : public TraceEvent::ConvertableToTraceFormat {
+class PLATFORM_EXPORT TracedValue final : public RefCounted<TracedValue> {
     WTF_MAKE_NONCOPYABLE(TracedValue);
 
 public:
+    ~TracedValue();
+
     static PassRefPtr<TracedValue> create();
 
     void endDictionary();
@@ -42,14 +44,16 @@ public:
     void beginArray();
     void beginDictionary();
 
-    String asTraceFormat() const override;
-    void estimateTraceMemoryOverhead(base::trace_event::TraceEventMemoryOverhead*) override;
+    String toString() const;
 
 private:
     TracedValue();
-    ~TracedValue() override;
 
+    // This will be moved (and become null) when TracedValue is passed to
+    // EventTracer::addTraceEvent().
     scoped_refptr<base::trace_event::TracedValue> m_tracedValue;
+
+    friend class EventTracer;
 };
 
 } // namespace blink