Mojo C++ bindings: Generate InterfaceHandle<> instead of InterfacePtr<>.

services/dart/dart_tracing.h

Index: services/dart/dart_tracing.h
diff --git a/services/dart/dart_tracing.h b/services/dart/dart_tracing.h
index ec5904e679bdd7a50ad640d8d78847d6d0a40684..15f423d03e3c14d30140a63e3493b6fe9f236812 100644
--- a/services/dart/dart_tracing.h
+++ b/services/dart/dart_tracing.h
@@ -28,8 +28,9 @@ class DartTraceProvider : public tracing::TraceProvider {
 
  private:
   // tracing::TraceProvider implementation:
-  void StartTracing(const mojo::String& categories,
-                    tracing::TraceRecorderPtr recorder) override;
+  void StartTracing(
+      const mojo::String& categories,
+      mojo::InterfaceHandle<tracing::TraceRecorder> recorder) override;
   void StopTracing() override;
 
   void SplitAndRecord(char* data, size_t length);