[SVG] SVGLength{,List} migration to new SVG property impl.

Source/core/svg/LinearGradientAttributes.h

Index: Source/core/svg/LinearGradientAttributes.h
diff --git a/Source/core/svg/LinearGradientAttributes.h b/Source/core/svg/LinearGradientAttributes.h
index ccf47b1ff57618e6ea836c86d2119d1c44dc946e..30d4cac0276fde0f44e954a79dc8570a925e0a71 100644
--- a/Source/core/svg/LinearGradientAttributes.h
+++ b/Source/core/svg/LinearGradientAttributes.h
@@ -25,26 +25,27 @@
 namespace WebCore {
 struct LinearGradientAttributes : GradientAttributes {
     LinearGradientAttributes()
-        : m_x1()
-        , m_y1()
-        , m_x2(LengthModeWidth, "100%")
-        , m_y2()
+        : m_x1(SVGLength::create(LengthModeWidth))
+        , m_y1(SVGLength::create(LengthModeWidth))
+        , m_x2(SVGLength::create(LengthModeWidth))
+        , m_y2(SVGLength::create(LengthModeWidth))
         , m_x1Set(false)
         , m_y1Set(false)
         , m_x2Set(false)
         , m_y2Set(false)
     {
+        m_x2->setValueAsString("100%", ASSERT_NO_EXCEPTION);
     }
 
-    SVGLength x1() const { return m_x1; }
-    SVGLength y1() const { return m_y1; }
-    SVGLength x2() const { return m_x2; }
-    SVGLength y2() const { return m_y2; }
+    SVGLength* x1() const { return m_x1.get(); }
+    SVGLength* y1() const { return m_y1.get(); }
+    SVGLength* x2() const { return m_x2.get(); }
+    SVGLength* y2() const { return m_y2.get(); }
 
-    void setX1(const SVGLength& value) { m_x1 = value; m_x1Set = true; }
-    void setY1(const SVGLength& value) { m_y1 = value; m_y1Set = true; }
-    void setX2(const SVGLength& value) { m_x2 = value; m_x2Set = true; }
-    void setY2(const SVGLength& value) { m_y2 = value; m_y2Set = true; }
+    void setX1(PassRefPtr<SVGLength> value) { m_x1 = value; m_x1Set = true; }
+    void setY1(PassRefPtr<SVGLength> value) { m_y1 = value; m_y1Set = true; }
+    void setX2(PassRefPtr<SVGLength> value) { m_x2 = value; m_x2Set = true; }
+    void setY2(PassRefPtr<SVGLength> value) { m_y2 = value; m_y2Set = true; }
 
     bool hasX1() const { return m_x1Set; }
     bool hasY1() const { return m_y1Set; }
@@ -53,10 +54,10 @@ struct LinearGradientAttributes : GradientAttributes {
 
 private:
     // Properties
-    SVGLength m_x1;
-    SVGLength m_y1;
-    SVGLength m_x2;
-    SVGLength m_y2;
+    RefPtr<SVGLength> m_x1;
+    RefPtr<SVGLength> m_y1;
+    RefPtr<SVGLength> m_x2;
+    RefPtr<SVGLength> m_y2;
 
     // Property states
     bool m_x1Set : 1;