Literal AtomicString construction can rely on strlen optimization.

third_party/WebKit/Source/core/inspector/NetworkResourcesData.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  * 1. Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *
@@ skipping 171 matching lines @@
     String filePath = response.downloadedFilePath();
     if (!filePath.isEmpty()) {
         OwnPtr<BlobData> blobData = BlobData::create();
         blobData->appendFile(filePath);
         AtomicString mimeType;
         if (response.isHTTP())
             mimeType = extractMIMETypeFromMediaType(response.httpHeaderField(HTTPNames::Content_Type));
         if (mimeType.isEmpty())
             mimeType = response.mimeType();
         if (mimeType.isEmpty())
-            mimeType = AtomicString("text/plain", AtomicString::ConstructFromLiteral);
+            mimeType = AtomicString("text/plain");
         blobData->setContentType(mimeType);
         resourceData->setDownloadedFileBlob(BlobDataHandle::create(blobData.release(), -1));
     }
 }
 
 void NetworkResourcesData::setResourceType(const String& requestId, InspectorPageAgent::ResourceType type)
 {
     ResourceData* resourceData = resourceDataForRequestId(requestId);
     if (!resourceData)
         return;
@@ skipping 179 matching lines @@
     while (size > m_maximumResourcesContentSize - m_contentSize) {
         String requestId = m_requestIdsDeque.takeFirst();
         ResourceData* resourceData = resourceDataForRequestId(requestId);
         if (resourceData)
             m_contentSize -= resourceData->evictContent();
     }
     return true;
 }
 
 } // namespace blink