This CL clean up patch in SVGElements.

Source/core/svg/graphics/SVGImage.cpp

Index: Source/core/svg/graphics/SVGImage.cpp
diff --git a/Source/core/svg/graphics/SVGImage.cpp b/Source/core/svg/graphics/SVGImage.cpp
index 8f19468ddfc89ddaaaa10b711f3bcaf86b1253a5..807f97ad8717871a1bd767240579aa60f3b77d1d 100644
--- a/Source/core/svg/graphics/SVGImage.cpp
+++ b/Source/core/svg/graphics/SVGImage.cpp
@@ -128,7 +128,7 @@ bool SVGImage::currentFrameHasSingleSecurityOrigin() const
 static SVGSVGElement* svgRootElement(Page* page)
 {
     if (!page)
-        return 0;
+        return nullptr;
     LocalFrame* frame = toLocalFrame(page->mainFrame());
     return frame->document()->accessSVGExtensions().rootElement();
 }
@@ -329,14 +329,14 @@ LayoutBox* SVGImage::embeddedContentBox() const
 {
     SVGSVGElement* rootElement = svgRootElement(m_page.get());
     if (!rootElement)
-        return 0;
+        return nullptr;
     return toLayoutBox(rootElement->layoutObject());
 }
 
 FrameView* SVGImage::frameView() const
 {
     if (!m_page)
-        return 0;
+        return nullptr;
 
     return toLocalFrame(m_page->mainFrame())->view();
 }