Update some uses of Value in chrome/browser to use the base:: namespace.

chrome/browser/net/gaia/gaia_oauth_fetcher.cc

Index: chrome/browser/net/gaia/gaia_oauth_fetcher.cc
diff --git a/chrome/browser/net/gaia/gaia_oauth_fetcher.cc b/chrome/browser/net/gaia/gaia_oauth_fetcher.cc
index 430ec0c568a7927ce8cd973dfcd86a3065fbd0c0..4a8f537394fc09b85a12443ab864d3ef045f7735 100644
--- a/chrome/browser/net/gaia/gaia_oauth_fetcher.cc
+++ b/chrome/browser/net/gaia/gaia_oauth_fetcher.cc
@@ -242,8 +242,9 @@ void GaiaOAuthFetcher::ParseUserInfoResponse(const std::string& data,
                                              std::string* email_result) {
   scoped_ptr<base::Value> value(base::JSONReader::Read(data));
   if (value->GetType() == base::Value::TYPE_DICTIONARY) {
-    Value* email_value;
-    DictionaryValue* dict = static_cast<DictionaryValue*>(value.get());
+    base::Value* email_value;
+    base::DictionaryValue* dict =
+        static_cast<base::DictionaryValue*>(value.get());
     if (dict->Get("email", &email_value)) {
       if (email_value->GetType() == base::Value::TYPE_STRING) {
         email_value->GetAsString(email_result);