Fix "IsLoopbackIp" to cover all loopback addresses; not just 127.0.0.1.

webrtc/base/ipaddress_unittest.cc

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 557 matching lines @@
 
 TEST(IPAddressTest, TestIsLoopback) {
   EXPECT_FALSE(IPIsLoopback(IPAddress(INADDR_ANY)));
   EXPECT_FALSE(IPIsLoopback(IPAddress(kIPv4PublicAddr)));
   EXPECT_FALSE(IPIsLoopback(IPAddress(in6addr_any)));
   EXPECT_FALSE(IPIsLoopback(IPAddress(kIPv6PublicAddr)));
   EXPECT_FALSE(IPIsLoopback(IPAddress(kIPv4MappedAnyAddr)));
   EXPECT_FALSE(IPIsLoopback(IPAddress(kIPv4MappedPublicAddr)));
 
   EXPECT_TRUE(IPIsLoopback(IPAddress(INADDR_LOOPBACK)));
+  // Try an address in the loopback range (127.0.0.0/8) other than the typical
+  // 127.0.0.1.
+  EXPECT_TRUE(IPIsLoopback(IPAddress(0x7f010203)));
   EXPECT_TRUE(IPIsLoopback(IPAddress(in6addr_loopback)));
 }
 
 // Verify that IPIsAny catches all cases of "any" address.
 TEST(IPAddressTest, TestIsAny) {
   IPAddress addr;
 
   EXPECT_TRUE(IPFromString(kIPv6AnyAddrString, &addr));
   EXPECT_TRUE(IPIsAny(addr));
 
@@ skipping 362 matching lines @@
   IPAddress *paddr1 = &addr1;
   IPAddress *paddr4 = &addr4;
   EXPECT_EQ(*paddr1, *paddr4);
 
   InterfaceAddress addr5(kIPv6LinkLocalAddr,
                          IPV6_ADDRESS_FLAG_TEMPORARY);
   EXPECT_NE(addr1, addr5);
 }
 
 }  // namespace rtc