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

third_party/WebKit/LayoutTests/fast/css/getComputedStyle/getComputedStyle-background-shorthand.html

Index: third_party/WebKit/LayoutTests/fast/css/getComputedStyle/getComputedStyle-background-shorthand.html
diff --git a/third_party/WebKit/LayoutTests/fast/css/getComputedStyle/getComputedStyle-background-shorthand.html b/third_party/WebKit/LayoutTests/fast/css/getComputedStyle/getComputedStyle-background-shorthand.html
index 8c236bb9336ff7f7cb6aa9efa1c1972d3b3252d9..885d5817fc0c710fb70046b8de96faf350ea6f3e 100644
--- a/third_party/WebKit/LayoutTests/fast/css/getComputedStyle/getComputedStyle-background-shorthand.html
+++ b/third_party/WebKit/LayoutTests/fast/css/getComputedStyle/getComputedStyle-background-shorthand.html
@@ -26,39 +26,39 @@ function checkComputedStyleValue() {
 }
 
 e.style.background = "red";
-shouldBe("computedStyle.getPropertyValue('background')", "'rgb(255, 0, 0) none repeat scroll 0% 0% / auto padding-box border-box'");
+shouldBeEqualToString("computedStyle.getPropertyValue('background')", 'rgb(255, 0, 0) none repeat scroll 0% 0% / auto padding-box border-box');
 shouldBe("checkComputedStyleValue()", "true");
 
 e.style.backgroundImage = "url(dummy://test.png)";
-shouldBe("computedStyle.getPropertyValue('background')", "'rgb(255, 0, 0) url(dummy://test.png) repeat scroll 0% 0% / auto padding-box border-box'");
+shouldBeEqualToString("computedStyle.getPropertyValue('background')", 'rgb(255, 0, 0) url("dummy://test.png") repeat scroll 0% 0% / auto padding-box border-box');
 shouldBe("checkComputedStyleValue()", "true");
 
 e.style.backgroundRepeat = "no-repeat";
-shouldBe("computedStyle.getPropertyValue('background')", "'rgb(255, 0, 0) url(dummy://test.png) no-repeat scroll 0% 0% / auto padding-box border-box'");
+shouldBeEqualToString("computedStyle.getPropertyValue('background')", 'rgb(255, 0, 0) url("dummy://test.png") no-repeat scroll 0% 0% / auto padding-box border-box');
 shouldBe("checkComputedStyleValue()", "true");
 
 e.style.backgroundAttachment = "fixed";
-shouldBe("computedStyle.getPropertyValue('background')", "'rgb(255, 0, 0) url(dummy://test.png) no-repeat fixed 0% 0% / auto padding-box border-box'");
+shouldBeEqualToString("computedStyle.getPropertyValue('background')", 'rgb(255, 0, 0) url("dummy://test.png") no-repeat fixed 0% 0% / auto padding-box border-box');
 shouldBe("checkComputedStyleValue()", "true");
 
 e.style.backgroundPosition = "right bottom";
-shouldBe("computedStyle.getPropertyValue('background')", "'rgb(255, 0, 0) url(dummy://test.png) no-repeat fixed 100% 100% / auto padding-box border-box'");
+shouldBeEqualToString("computedStyle.getPropertyValue('background')", 'rgb(255, 0, 0) url("dummy://test.png") no-repeat fixed 100% 100% / auto padding-box border-box');
 shouldBe("checkComputedStyleValue()", "true");
 
 e.style.backgroundSize = "cover";
-shouldBe("computedStyle.getPropertyValue('background')", "'rgb(255, 0, 0) url(dummy://test.png) no-repeat fixed 100% 100% / cover padding-box border-box'");
+shouldBeEqualToString("computedStyle.getPropertyValue('background')", 'rgb(255, 0, 0) url("dummy://test.png") no-repeat fixed 100% 100% / cover padding-box border-box');
 shouldBe("checkComputedStyleValue()", "true");
 
 e.style.backgroundOrigin = "content-box";
-shouldBe("computedStyle.getPropertyValue('background')", "'rgb(255, 0, 0) url(dummy://test.png) no-repeat fixed 100% 100% / cover content-box border-box'");
+shouldBeEqualToString("computedStyle.getPropertyValue('background')", 'rgb(255, 0, 0) url("dummy://test.png") no-repeat fixed 100% 100% / cover content-box border-box');
 shouldBe("checkComputedStyleValue()", "true");
 
 e.style.backgroundClip = "padding-box";
-shouldBe("computedStyle.getPropertyValue('background')", "'rgb(255, 0, 0) url(dummy://test.png) no-repeat fixed 100% 100% / cover content-box padding-box'");
+shouldBeEqualToString("computedStyle.getPropertyValue('background')", 'rgb(255, 0, 0) url("dummy://test.png") no-repeat fixed 100% 100% / cover content-box padding-box');
 shouldBe("checkComputedStyleValue()", "true");
 
 e.style.background = "border-box padding-box url(dummy://test.png) green 45% / contain repeat fixed";
-shouldBe("computedStyle.getPropertyValue('background')", "'rgb(0, 128, 0) url(dummy://test.png) repeat fixed 45% 50% / contain border-box padding-box'");
+shouldBeEqualToString("computedStyle.getPropertyValue('background')", 'rgb(0, 128, 0) url("dummy://test.png") repeat fixed 45% 50% / contain border-box padding-box');
 shouldBe("checkComputedStyleValue()", "true");
 
 document.body.removeChild(testContainer);