No need to support dasher domains.

google_apis/gaia/gaia_auth_util_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "google_apis/gaia/gaia_auth_util.h"
 
 #include "googleurl/src/gurl.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace gaia {
@@ skipping 70 matching lines @@
 }
 
 TEST(GaiaAuthUtilTest, SanitizeExistingDomain) {
   const char existing[] = "test@example.com";
   EXPECT_EQ(existing, SanitizeEmail(existing));
 }
 
 TEST(GaiaAuthUtilTest, IsGaiaSignonRealm) {
   // Only https versions of Gaia URLs should be considered valid.
   EXPECT_TRUE(IsGaiaSignonRealm(GURL("https://accounts.google.com/")));
-  EXPECT_TRUE(IsGaiaSignonRealm(GURL("https://www.google.com/")));
   EXPECT_FALSE(IsGaiaSignonRealm(GURL("http://accounts.google.com/")));
-  EXPECT_FALSE(IsGaiaSignonRealm(GURL("http://www.google.com/")));
 
   // Other Google URLs are not valid.
+  EXPECT_FALSE(IsGaiaSignonRealm(GURL("https://www.google.com/")));
+  EXPECT_FALSE(IsGaiaSignonRealm(GURL("http://www.google.com/")));
   EXPECT_FALSE(IsGaiaSignonRealm(GURL("https://google.com/")));
   EXPECT_FALSE(IsGaiaSignonRealm(GURL("https://mail.google.com/")));
 
   // Other https URLs are not valid.
   EXPECT_FALSE(IsGaiaSignonRealm(GURL("https://www.example.com/")));
 }
 
 }  // namespace gaia