[wrapper-tracing] Untangle non-trivial mixin ctors

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

Index: third_party/WebKit/Source/modules/fetch/Response.cpp
diff --git a/third_party/WebKit/Source/modules/fetch/Response.cpp b/third_party/WebKit/Source/modules/fetch/Response.cpp
index 50d5c8629a0651016371a11d15f16387116cf707..3fcf587dd6e423c35f1462ea4ca14afde17fe620 100644
--- a/third_party/WebKit/Source/modules/fetch/Response.cpp
+++ b/third_party/WebKit/Source/modules/fetch/Response.cpp
@@ -56,7 +56,7 @@ FetchResponseData* createFetchResponseDataFromWebResponse(
     response->headerList()->append(i->key, i->value);
   }
 
-  response->replaceBodyStreamBuffer(new BodyStreamBuffer(
+  response->replaceBodyStreamBuffer(BodyStreamBuffer::create(
       scriptState, new BlobBytesConsumer(scriptState->getExecutionContext(),
                                          webResponse.blobDataHandle())));
 
@@ -136,16 +136,16 @@ Response* Response::create(ScriptState* scriptState,
     // https://crbug.com/335871.
   } else if (V8Blob::hasInstance(body, isolate)) {
     Blob* blob = V8Blob::toImpl(body.As<v8::Object>());
-    bodyBuffer = new BodyStreamBuffer(
+    bodyBuffer = BodyStreamBuffer::create(
         scriptState,
         new BlobBytesConsumer(executionContext, blob->blobDataHandle()));
     contentType = blob->type();
   } else if (body->IsArrayBuffer()) {
-    bodyBuffer = new BodyStreamBuffer(
+    bodyBuffer = BodyStreamBuffer::create(
         scriptState, new FormDataBytesConsumer(
                          V8ArrayBuffer::toImpl(body.As<v8::Object>())));
   } else if (body->IsArrayBufferView()) {
-    bodyBuffer = new BodyStreamBuffer(
+    bodyBuffer = BodyStreamBuffer::create(
         scriptState, new FormDataBytesConsumer(
                          V8ArrayBufferView::toImpl(body.As<v8::Object>())));
   } else if (V8FormData::hasInstance(body, isolate)) {
@@ -155,25 +155,25 @@ Response* Response::create(ScriptState* scriptState,
     // FormDataEncoder::generateUniqueBoundaryString.
     contentType = AtomicString("multipart/form-data; boundary=") +
                   formData->boundary().data();
-    bodyBuffer = new BodyStreamBuffer(
+    bodyBuffer = BodyStreamBuffer::create(
         scriptState,
         new FormDataBytesConsumer(executionContext, formData.release()));
   } else if (V8URLSearchParams::hasInstance(body, isolate)) {
     RefPtr<EncodedFormData> formData =
         V8URLSearchParams::toImpl(body.As<v8::Object>())->toEncodedFormData();
-    bodyBuffer = new BodyStreamBuffer(
+    bodyBuffer = BodyStreamBuffer::create(
         scriptState,
         new FormDataBytesConsumer(executionContext, formData.release()));
     contentType = "application/x-www-form-urlencoded;charset=UTF-8";
   } else if (ReadableStreamOperations::isReadableStream(scriptState,
                                                         bodyValue)) {
-    bodyBuffer = new BodyStreamBuffer(scriptState, bodyValue);
+    bodyBuffer = BodyStreamBuffer::create(scriptState, bodyValue);
   } else {
     String string = toUSVString(isolate, body, exceptionState);
     if (exceptionState.hadException())
       return nullptr;
-    bodyBuffer =
-        new BodyStreamBuffer(scriptState, new FormDataBytesConsumer(string));
+    bodyBuffer = BodyStreamBuffer::create(scriptState,
+                                          new FormDataBytesConsumer(string));
     contentType = "text/plain;charset=UTF-8";
   }
   Response* response =