Literal AtomicString construction can rely on strlen optimization.

third_party/WebKit/Source/core/svg/graphics/SVGImage.cpp

 /*
  * Copyright (C) 2006 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. 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 454 matching lines @@
     if (allDataReceived) {
         // SVGImage will fire events (and the default C++ handlers run) but doesn't
         // actually allow script to run so it's fine to call into it. We allow this
         // since it means an SVG data url can synchronously load like other image
         // types.
         EventDispatchForbiddenScope::AllowUserAgentEvents allowUserAgentEvents;
 
         DEFINE_STATIC_LOCAL(OwnPtrWillBePersistent<FrameLoaderClient>, dummyFrameLoaderClient, (EmptyFrameLoaderClient::create()));
 
         if (m_page) {
-            toLocalFrame(m_page->mainFrame())->loader().load(FrameLoadRequest(0, blankURL(), SubstituteData(data(), AtomicString("image/svg+xml", AtomicString::ConstructFromLiteral),
-                AtomicString("UTF-8", AtomicString::ConstructFromLiteral), KURL(), ForceSynchronousLoad)));
+            toLocalFrame(m_page->mainFrame())->loader().load(FrameLoadRequest(0, blankURL(), SubstituteData(data(), AtomicString("image/svg+xml"),
+                AtomicString("UTF-8"), KURL(), ForceSynchronousLoad)));
             return true;
         }
 
         Page::PageClients pageClients;
         fillWithEmptyClients(pageClients);
         m_chromeClient = SVGImageChromeClient::create(this);
         pageClients.chromeClient = m_chromeClient.get();
 
         // FIXME: If this SVG ends up loading itself, we might leak the world.
         // The Cache code does not know about ImageResources holding Frames and
@@ skipping 33 matching lines @@
         FrameLoader& loader = frame->loader();
         loader.forceSandboxFlags(SandboxAll);
 
         frame->view()->setScrollbarsSuppressed(true);
         frame->view()->setCanHaveScrollbars(false); // SVG Images will always synthesize a viewBox, if it's not available, and thus never see scrollbars.
         frame->view()->setTransparent(true); // SVG Images are transparent.
 
         m_page = page.release();
 
         TRACE_EVENT0("blink", "SVGImage::dataChanged::load");
-        loader.load(FrameLoadRequest(0, blankURL(), SubstituteData(data(), AtomicString("image/svg+xml", AtomicString::ConstructFromLiteral),
-            AtomicString("UTF-8", AtomicString::ConstructFromLiteral), KURL(), ForceSynchronousLoad)));
+        loader.load(FrameLoadRequest(0, blankURL(), SubstituteData(data(), AtomicString("image/svg+xml"),
+            AtomicString("UTF-8"), KURL(), ForceSynchronousLoad)));
 
         // Set the concrete object size before a container size is available.
         m_intrinsicSize = roundedIntSize(concreteObjectSize(FloatSize(300, 150)));
     }
 
     return m_page;
 }
 
 String SVGImage::filenameExtension() const
 {
     return "svg";
 }
 
 } // namespace blink