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

chromeos/network/onc/onc_validator.cc

Index: chromeos/network/onc/onc_validator.cc
diff --git a/chromeos/network/onc/onc_validator.cc b/chromeos/network/onc/onc_validator.cc
index 48cc183d952f82119fbaba1691f92fa27c5ad92f..30a1bc7b9ddb1b71ae3740624cce9526df4644f1 100644
--- a/chromeos/network/onc/onc_validator.cc
+++ b/chromeos/network/onc/onc_validator.cc
@@ -28,7 +28,7 @@ std::string ValueToString(const base::Value& value) {
 
 // Copied from policy/configuration_policy_handler.cc.
 // TODO(pneubeck): move to a common place like base/.
-std::string ValueTypeToString(Value::Type type) {
+std::string ValueTypeToString(base::Value::Type type) {
   static const char* strings[] = {
     "null",
     "boolean",