Literal AtomicString construction can rely on strlen optimization.

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/fetch/Response.h"
 
 #include "bindings/core/v8/Dictionary.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/V8ArrayBuffer.h"
@@ skipping 117 matching lines @@
         bodyHandle = FetchBlobDataConsumerHandle::create(executionContext, blob->blobDataHandle());
         contentType = blob->type();
     } else if (V8ArrayBuffer::hasInstance(body, isolate)) {
         bodyHandle = FetchFormDataConsumerHandle::create(V8ArrayBuffer::toImpl(body.As<v8::Object>()));
     } else if (V8ArrayBufferView::hasInstance(body, isolate)) {
         bodyHandle = FetchFormDataConsumerHandle::create(V8ArrayBufferView::toImpl(body.As<v8::Object>()));
     } else if (V8FormData::hasInstance(body, isolate)) {
         RefPtr<EncodedFormData> formData = V8FormData::toImpl(body.As<v8::Object>())->encodeMultiPartFormData();
         // Here we handle formData->boundary() as a C-style string. See
         // FormDataEncoder::generateUniqueBoundaryString.
-        contentType = AtomicString("multipart/form-data; boundary=", AtomicString::ConstructFromLiteral) + formData->boundary().data();
+        contentType = AtomicString("multipart/form-data; boundary=") + formData->boundary().data();
         bodyHandle = FetchFormDataConsumerHandle::create(executionContext, formData.release());
     } else if (RuntimeEnabledFeatures::responseConstructedWithReadableStreamEnabled() && ReadableStreamOperations::isReadableStream(scriptState, bodyValue)) {
         bodyHandle = ReadableStreamDataConsumerHandle::create(scriptState, bodyValue);
         reader = ReadableStreamOperations::getReader(scriptState, bodyValue, exceptionState);
         if (exceptionState.hadException()) {
             reader = ScriptValue();
             bodyHandle = createFetchDataConsumerHandleFromWebHandle(createUnexpectedErrorDataConsumerHandle());
             exceptionState.clearException();
         } else {
             bodyHandle = ReadableStreamDataConsumerHandle::create(scriptState, reader);
@@ skipping 272 matching lines @@
 }
 
 DEFINE_TRACE(Response)
 {
     Body::trace(visitor);
     visitor->trace(m_response);
     visitor->trace(m_headers);
 }
 
 } // namespace blink