Fix uninitialized reads in DnsConfigServiceWin tests.

net/dns/dns_config_service_win.h

 // 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.
 
 #ifndef NET_DNS_DNS_CONFIG_SERVICE_WIN_H_
 #define NET_DNS_DNS_CONFIG_SERVICE_WIN_H_
 
 // The sole purpose of dns_config_service_win.h is for unittests so we just
 // include these headers here.
 #include <winsock2.h>
@@ skipping 29 matching lines @@
 // are converted to punycode.
 bool NET_EXPORT_PRIVATE ParseSearchList(const base::string16& value,
                                         std::vector<std::string>* out);
 
 // All relevant settings read from registry and IP Helper. This isolates our
 // logic from system calls and is exposed for unit tests. Keep it an aggregate
 // struct for easy initialization.
 struct NET_EXPORT_PRIVATE DnsSystemSettings {
   // The |set| flag distinguishes between empty and unset values.
   struct RegString {
-    bool set;
+    bool set = false;
     base::string16 value;
   };
 
   struct RegDword {
-    bool set;
+    bool set = false;
     DWORD value;
   };
 
   struct DevolutionSetting {
     // UseDomainNameDevolution
     RegDword enabled;
     // DomainNameDevolutionLevel
     RegDword level;
   };
 
@@ skipping 74 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(DnsConfigServiceWin);
 };
 
 }  // namespace internal
 
 }  // namespace net
 
 #endif  // NET_DNS_DNS_CONFIG_SERVICE_WIN_H_