Fix tests broken by default text color change.

sky/tests/clipping/background-opaque-clipped-gradients.sky

Index: sky/tests/clipping/background-opaque-clipped-gradients.sky
diff --git a/sky/tests/clipping/background-opaque-clipped-gradients.sky b/sky/tests/clipping/background-opaque-clipped-gradients.sky
deleted file mode 100644
index 61c373c6e237bb26a57053eba7195fbd89346ab0..0000000000000000000000000000000000000000
--- a/sky/tests/clipping/background-opaque-clipped-gradients.sky
+++ /dev/null
@@ -1,17 +0,0 @@
-<sky>
-<import src="../resources/dump-as-render-tree.sky" />
-<style>
-div {
-    width: 100px;
-    height: 100px;
-    padding: 25px;
-    border: 25px dotted;
-    /* TODO(ojan): background-image appears to be broken. */
-    background-image: linear-gradient(top, yellow, yellow), linear-gradient(top, blue, blue), -linear-gradient(top, green, green);
-    background-clip: content-box, padding-box, border-box;
-}
-</style>
-<!-- TODO(ojan): Make this a reftest once we support them. -->
-<p>Test passes if the image below shows nested green, blue and yellow squares with a dotted black border.</p>
-<div></div>
-</sky>