Make sure <url>s are being serialized according to spec

third_party/WebKit/LayoutTests/fast/css/script-tests/image-set-setting.js

Index: third_party/WebKit/LayoutTests/fast/css/script-tests/image-set-setting.js
diff --git a/third_party/WebKit/LayoutTests/fast/css/script-tests/image-set-setting.js b/third_party/WebKit/LayoutTests/fast/css/script-tests/image-set-setting.js
index 1488e25648559cc080e301dbd93909b16141463a..cc5718fcdb6e0bba275882453475833bdba84321 100644
--- a/third_party/WebKit/LayoutTests/fast/css/script-tests/image-set-setting.js
+++ b/third_party/WebKit/LayoutTests/fast/css/script-tests/image-set-setting.js
@@ -10,34 +10,30 @@ function testComputedStyle(property, fullRule)
     return computedValue;
 }
 
-function testImageSetRule(description, property, rule, expected)
+function testImageSetRule(description, rule, expected)
 {
     debug("");
     debug(description + " : " + rule);
 
-    var fullRule = "-webkit-image-set(" + rule + ")";
-    shouldBeEqualToString('testComputedStyle("' + property + '", "' + fullRule + '")', fullRule);
+    var fullRule = '-webkit-image-set(' + rule + ')';
+    var call = 'testComputedStyle(`background-image`, `' + fullRule + '`)';
+    shouldBeEqualToString(call, fullRule);
 }
 
 testImageSetRule("Single value for background-image",
-                "background-image",
-                "url(http://www.webkit.org/a) 1x");
+                'url("http://www.webkit.org/a") 1x');
 
 testImageSetRule("Multiple values for background-image",
-                "background-image",
-                "url(http://www.webkit.org/a) 1x, url(http://www.webkit.org/b) 2x");
+                'url("http://www.webkit.org/a") 1x, url("http://www.webkit.org/b") 2x');
 
 testImageSetRule("Multiple values for background-image, out of order",
-                "background-image",
-                "url(http://www.webkit.org/c) 3x, url(http://www.webkit.org/b) 2x, url(http://www.webkit.org/a) 1x");
+                'url("http://www.webkit.org/c") 3x, url("http://www.webkit.org/b") 2x, url("http://www.webkit.org/a") 1x');
 
 testImageSetRule("Duplicate values for background-image",
-                "background-image",
-                "url(http://www.webkit.org/c) 1x, url(http://www.webkit.org/b) 2x, url(http://www.webkit.org/a) 1x");
+                'url("http://www.webkit.org/c") 1x, url("http://www.webkit.org/b") 2x, url("http://www.webkit.org/a") 1x');
 
 testImageSetRule("Fractional values for background-image",
-                "background-image",
-                "url(http://www.webkit.org/c) 0.2x, url(http://www.webkit.org/b) 2.3x, url(http://www.webkit.org/a) 12.3456x");
+                'url("http://www.webkit.org/c") 0.2x, url("http://www.webkit.org/b") 2.3x, url("http://www.webkit.org/a") 12.3456x');
 
 // FIXME: We should also be testing the behavior of negative values somewhere, but it's currently
 // broken.  http://wkb.ug/100132