[wrapper-tracing] Untangle non-trivial mixin ctors

third_party/WebKit/Source/modules/fetch/ResponseTest.cpp

Index: third_party/WebKit/Source/modules/fetch/ResponseTest.cpp
diff --git a/third_party/WebKit/Source/modules/fetch/ResponseTest.cpp b/third_party/WebKit/Source/modules/fetch/ResponseTest.cpp
index ab7d6137010e3964b80487238befe327913a7da0..6fab69ba64941ca2e67805723aebb8ab13d2a9bb 100644
--- a/third_party/WebKit/Source/modules/fetch/ResponseTest.cpp
+++ b/third_party/WebKit/Source/modules/fetch/ResponseTest.cpp
@@ -215,7 +215,7 @@ BodyStreamBuffer* createHelloWorldBuffer(ScriptState* scriptState) {
   src->add(Command(Command::Data, "Hello, "));
   src->add(Command(Command::Data, "world"));
   src->add(Command(Command::Done));
-  return new BodyStreamBuffer(scriptState, src);
+  return BodyStreamBuffer::create(scriptState, src);
 }
 
 TEST(ServiceWorkerResponseTest, BodyStreamBufferCloneDefault) {
@@ -271,7 +271,7 @@ TEST(ServiceWorkerResponseTest, BodyStreamBufferCloneOpaque) {
 
 TEST(ServiceWorkerResponseTest, BodyStreamBufferCloneError) {
   V8TestingScope scope;
-  BodyStreamBuffer* buffer = new BodyStreamBuffer(
+  BodyStreamBuffer* buffer = BodyStreamBuffer::create(
       scope.getScriptState(),
       BytesConsumer::createErrored(BytesConsumer::Error()));
   FetchResponseData* fetchResponseData =