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

google_apis/gaia/oauth2_access_token_fetcher.cc

Index: google_apis/gaia/oauth2_access_token_fetcher.cc
diff --git a/google_apis/gaia/oauth2_access_token_fetcher.cc b/google_apis/gaia/oauth2_access_token_fetcher.cc
index 39efbf08080029558c6e1d44c1a7bbee902f8cde..e5a17f9a136b38bfa77ac40e4ec5f648829af4e8 100644
--- a/google_apis/gaia/oauth2_access_token_fetcher.cc
+++ b/google_apis/gaia/oauth2_access_token_fetcher.cc
@@ -226,7 +226,8 @@ bool OAuth2AccessTokenFetcher::ParseGetAccessTokenResponse(
   if (!value.get() || value->GetType() != base::Value::TYPE_DICTIONARY)
     return false;
 
-  DictionaryValue* dict = static_cast<DictionaryValue*>(value.get());
+  base::DictionaryValue* dict =
+      static_cast<base::DictionaryValue*>(value.get());
   return dict->GetString(kAccessTokenKey, access_token) &&
       dict->GetInteger(kExpiresInKey, expires_in);
 }