Remove some dead code in SVG "mixins"

third_party/WebKit/Source/core/svg/SVGFitToViewBox.h

Index: third_party/WebKit/Source/core/svg/SVGFitToViewBox.h
diff --git a/third_party/WebKit/Source/core/svg/SVGFitToViewBox.h b/third_party/WebKit/Source/core/svg/SVGFitToViewBox.h
index db2bd05955391e8d3828acc5d00c17dbbde13299..89432009d431d99b408055b2506fb96700029d36 100644
--- a/third_party/WebKit/Source/core/svg/SVGFitToViewBox.h
+++ b/third_party/WebKit/Source/core/svg/SVGFitToViewBox.h
@@ -23,21 +23,16 @@
 #define SVGFitToViewBox_h
 
 #include "core/SVGNames.h"
-#include "core/dom/Document.h"
 #include "core/dom/QualifiedName.h"
 #include "core/svg/SVGAnimatedPreserveAspectRatio.h"
 #include "core/svg/SVGAnimatedRect.h"
-#include "core/svg/SVGDocumentExtensions.h"
-#include "core/svg/SVGParsingError.h"
 #include "core/svg/SVGPreserveAspectRatio.h"
 #include "core/svg/SVGRect.h"
 #include "platform/heap/Handle.h"
-#include "wtf/HashSet.h"
 
 namespace blink {
 
 class AffineTransform;
-class Document;
 
 class SVGFitToViewBox : public WillBeGarbageCollectedMixin {
 public:
@@ -49,20 +44,6 @@ public:
     static AffineTransform viewBoxToViewTransform(const FloatRect& viewBoxRect, PassRefPtrWillBeRawPtr<SVGPreserveAspectRatio>, float viewWidth, float viewHeight);
 
     static bool isKnownAttribute(const QualifiedName&);
-    static void addSupportedAttributes(HashSet<QualifiedName>&);
-
-    bool parseAttribute(const QualifiedName& name, const AtomicString& value, Document& document, SVGParsingError& parseError)
-    {
-        if (name == SVGNames::viewBoxAttr) {
-            m_viewBox->setBaseValueAsString(value, parseError);
-            return true;
-        }
-        if (name == SVGNames::preserveAspectRatioAttr) {
-            m_preserveAspectRatio->setBaseValueAsString(value, parseError);
-            return true;
-        }
-        return false;
-    }
 
     bool hasEmptyViewBox() const { return m_viewBox->currentValue()->isValid() && m_viewBox->currentValue()->value().isEmpty(); }