[Chromecast] Fix url_util_unittest failure on Cast builds.

Origional CL: chromium/1818460

Bug: b/141260084
Test: content_unittests
Change-Id: I3ab645e0e45184e65e3ff07bd71ce17c2d3d1b25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1823558Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Junbo Ke <juke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699561}

content/public/common/url_utils_unittest.cc

@@ -41,8 +41,13 @@ TEST(UrlUtilsTest, IsSafeRedirectTarget) {
   EXPECT_FALSE(IsSafeRedirectTarget(GURL(), CreateValidURL("about:blank")));
   EXPECT_FALSE(IsSafeRedirectTarget(
       GURL(), CreateValidURL("filesystem:http://foo.com/bar")));
+#if !defined(CHROMECAST_BUILD)
   EXPECT_FALSE(
       IsSafeRedirectTarget(GURL(), CreateValidURL("data:text/plain,foo")));
+#else
+  EXPECT_TRUE(
+      IsSafeRedirectTarget(GURL(), CreateValidURL("data:text/plain,foo")));
+#endif
   EXPECT_FALSE(
       IsSafeRedirectTarget(GURL(), CreateValidURL("blob:https://foo.com/bar")));
 #if defined(OS_ANDROID)