Fix ParseCIDRBlock() to no longer accept invalid inputs.

net/base/ip_address_unittest.cc

 // Copyright (c) 2015 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 "net/base/ip_address.h"
 
 #include <vector>
 
 #include "base/strings/string_number_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 234 matching lines @@
                                       "192.168.0.1",
                                       "::1",
                                       "/",
                                       "/1",
                                       "1",
                                       "192.168.1.1/-1",
                                       "192.168.1.1/33",
                                       "::1/-3",
                                       "a::3/129",
                                       "::1/x",
-                                      "192.168.0.1//11"};
+                                      "192.168.0.1//11",
+                                      "192.168.1.1/+1",
+                                      "192.168.1.1/ +1",
+                                      "192.168.1.1/"};
 
   for (const auto& bad_literal : bad_literals) {
     IPAddress ip_address;
     size_t prefix_length_in_bits;
 
     EXPECT_FALSE(
         ParseCIDRBlock(bad_literal, &ip_address, &prefix_length_in_bits));
   }
 }
 
@@ skipping 52 matching lines @@
 
   // Prefix is longer than the address.
   uint8_t ipv6_prefix5[] = {42, 0, 20, 80, 64, 12, 12, 9, 0,
                             0,  0, 0,  0,  0,  0,  0,  10};
   EXPECT_FALSE(IPAddressStartsWith(ipv6_address, ipv6_prefix5));
 }
 
 }  // anonymous namespace
 
 }  // namespace net