CSP, PlzNavigate: make clear what happens with unique origins.

content/common/content_security_policy/csp_source_unittest.cc

Index: content/common/content_security_policy/csp_source_unittest.cc
diff --git a/content/common/content_security_policy/csp_source_unittest.cc b/content/common/content_security_policy/csp_source_unittest.cc
index 50879f2719f9af7b15d7eac887d8e0f0fd12cdb6..81a1c5f14c18a6e51cd4572fde1197976a64be52 100644
--- a/content/common/content_security_policy/csp_source_unittest.cc
+++ b/content/common/content_security_policy/csp_source_unittest.cc
@@ -112,14 +112,15 @@ TEST(CSPSourceTest, AllowScheme) {
     EXPECT_FALSE(Allow(source, GURL("http://a.com"), &context));
     EXPECT_TRUE(Allow(source, GURL("ftp://a.com"), &context));
 
-    // Self's scheme is unique.
+    // Self's scheme is unique (non standard scheme).
     context.SetSelf(url::Origin(GURL("non-standard-scheme://a.com")));
-    // TODO(mkwst, arthursonzogni): This result might be wrong.
-    // See http://crbug.com/692449
     EXPECT_FALSE(Allow(source, GURL("http://a.com"), &context));
-    // TODO(mkwst, arthursonzogni): This result might be wrong.
-    // See http://crbug.com/692449
     EXPECT_FALSE(Allow(source, GURL("non-standard-scheme://a.com"), &context));
+
+    // Self's scheme is unique (data-url).
+    context.SetSelf(url::Origin(GURL("data:text/html,<iframe src=[...]>")));
+    EXPECT_FALSE(Allow(source, GURL("http://a.com"), &context));
+    EXPECT_FALSE(Allow(source, GURL("data:text/html,hello"), &context));
   }
 }