Introduce isSVGFontElement() and isSVGImageElement(), and use them

Source/core/platform/chromium/PasteboardChromium.cpp

Index: Source/core/platform/chromium/PasteboardChromium.cpp
diff --git a/Source/core/platform/chromium/PasteboardChromium.cpp b/Source/core/platform/chromium/PasteboardChromium.cpp
index fd1711ff43a7fd6eebad42f898d5ea7e0b305aff..891ca9586bef511cec3f6aae93112b8d7fc7ab3d 100644
--- a/Source/core/platform/chromium/PasteboardChromium.cpp
+++ b/Source/core/platform/chromium/PasteboardChromium.cpp
@@ -48,6 +48,7 @@
 #include "core/platform/graphics/Image.h"
 #include "core/platform/graphics/skia/NativeImageSkia.h"
 #include "core/rendering/RenderImage.h"
+#include "core/svg/SVGImageElement.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebClipboard.h"
 #include "public/platform/WebDragData.h"
@@ -144,7 +145,7 @@ void Pasteboard::writeImage(Node* node, const KURL&, const String& title)
     AtomicString urlString;
     if (node->hasTagName(HTMLNames::imgTag) || node->hasTagName(HTMLNames::inputTag))
         urlString = toElement(node)->getAttribute(HTMLNames::srcAttr);
-    else if (node->hasTagName(SVGNames::imageTag))
+    else if (isSVGImageElement(node))
         urlString = toElement(node)->getAttribute(XLinkNames::hrefAttr);
     else if (node->hasTagName(HTMLNames::embedTag) || node->hasTagName(HTMLNames::objectTag)) {
         Element* element = toElement(node);