Simply FrameLoaderStateMachine and FrameLoader::transitionToCommitted().

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 328 matching lines @@
         m_page->settings()->setMediaEnabled(false);
         m_page->settings()->setScriptEnabled(false);
         m_page->settings()->setPluginsEnabled(false);
 
         RefPtr<Frame> frame = Frame::create(m_page.get(), 0, dummyFrameLoaderClient);
         frame->setView(FrameView::create(frame.get()));
         frame->init();
         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.
 
         ASSERT(loader->activeDocumentLoader()); // DocumentLoader should have been created by frame->init().
         loader->activeDocumentLoader()->writer()->setMIMEType("image/svg+xml");
         loader->activeDocumentLoader()->writer()->begin(KURL()); // create the empty document
         loader->activeDocumentLoader()->writer()->addData(data()->data(), data()->size());
         loader->activeDocumentLoader()->writer()->end();
 
         // Set the intrinsic size before a container size is available.
@@ skipping 12 matching lines @@
 {
     MemoryClassInfo info(memoryObjectInfo, this, WebCoreMemoryTypes::CachedResourceImage);
     Image::reportMemoryUsage(memoryObjectInfo);
     info.addMember(m_chromeClient, "chromeClient");
     info.addMember(m_page, "page");
 }
 
 }
 
 #endif // ENABLE(SVG)