fix(ngSanitize): attribute name: xmlns:href -> xlink:href

Closes #9769

Author: gkalpak

src/ngSanitize/sanitize.js

@@ -211,7 +211,7 @@ var validElements = angular.extend({},
                                    svgElements);
 
 //Attributes that have href and hence need to be sanitized
-var uriAttrs = makeMap("background,cite,href,longdesc,src,usemap,xmlns:href");
+var uriAttrs = makeMap("background,cite,href,longdesc,src,usemap,xlink:href");
 
 var htmlAttrs = makeMap('abbr,align,alt,axis,bgcolor,border,cellpadding,cellspacing,class,clear,'+
     'color,cols,colspan,compact,coords,dir,face,headers,height,hreflang,hspace,'+