Change Cronet's "disable_ipv6" to "disable_ipv6_on_wifi"

net/dns/host_resolver.h

Index: net/dns/host_resolver.h
diff --git a/net/dns/host_resolver.h b/net/dns/host_resolver.h
index 33cdd34e7200a59b7a5b25dbefbde49a6ca36ce9..ba5078705d4ff78ff1a6bc590c79524f1cb32c57 100644
--- a/net/dns/host_resolver.h
+++ b/net/dns/host_resolver.h
@@ -221,6 +221,11 @@ class NET_EXPORT HostResolver {
   virtual void SetDefaultAddressFamily(AddressFamily address_family);
   virtual AddressFamily GetDefaultAddressFamily() const;
 
+  // Sets the HostResolver to assume that IPv6 is unreachable when on a wifi
+  // connection. See https://crbug.com/696569 for further context.
+  virtual void SetNoIPv6OnWifi(bool no_ipv6_on_wifi);
+  virtual bool GetNoIPv6OnWifi();
+
   // Creates a HostResolver implementation that queries the underlying system.
   // (Except if a unit-test has changed the global HostResolverProc using
   // ScopedHostResolverProc to intercept requests to the system).