Convert most of extensions and some other random stuff to using the base namespace for Values.

net/dns/dns_transaction.cc

Index: net/dns/dns_transaction.cc
diff --git a/net/dns/dns_transaction.cc b/net/dns/dns_transaction.cc
index 6d377104e3e63e6a98eceb5b0a280c9765b0480d..fadb578c02b304c3d4963469f30b1447b7118fc7 100644
--- a/net/dns/dns_transaction.cc
+++ b/net/dns/dns_transaction.cc
@@ -97,7 +97,7 @@ class DnsAttempt {
   // Returns a Value representing the received response, along with a reference
   // to the NetLog source source of the UDP socket used.  The request must have
   // completed before this is called.
-  Value* NetLogResponseCallback(NetLog::LogLevel log_level) const {
+  base::Value* NetLogResponseCallback(NetLog::LogLevel log_level) const {
     DCHECK(GetResponse()->IsValid());
 
     base::DictionaryValue* dict = new base::DictionaryValue();