Allow a unique origin to compare equal to itself

url/origin.cc

Index: url/origin.cc
diff --git a/url/origin.cc b/url/origin.cc
index e449532791a9ecf2ccd53659cf1c912ded682f8d..d09fdbcef2f617ec380fca2bf83cc8b3e3a0ae6c 100644
--- a/url/origin.cc
+++ b/url/origin.cc
@@ -160,6 +160,9 @@ GURL Origin::GetURL() const {
 }
 
 bool Origin::IsSameOriginWith(const Origin& other) const {
+  if (this == &other)
+    return true;
+
   if (opaque_ || other.opaque_)
     return false;