Added allocator matcros to blink classes and structures in core/svg.

Source/core/svg/ColorDistance.h

Index: Source/core/svg/ColorDistance.h
diff --git a/Source/core/svg/ColorDistance.h b/Source/core/svg/ColorDistance.h
index 89b11d86a7181d64c7ef317467e1ae60f8531b3a..9c6d2524c59276baa9495cf6d258d52f20793beb 100644
--- a/Source/core/svg/ColorDistance.h
+++ b/Source/core/svg/ColorDistance.h
@@ -20,11 +20,14 @@
 #ifndef ColorDistance_h
 #define ColorDistance_h
 
+#include "wtf/Allocator.h"
+
 namespace blink {
 
 class Color;
 
 class ColorDistance {
+    STATIC_ONLY(ColorDistance);
 public:
     static Color addColors(const Color&, const Color&);
     static float distance(const Color& fromColor, const Color& toColor);