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

chrome/browser/extensions/external_registry_loader_win.cc

Index: chrome/browser/extensions/external_registry_loader_win.cc
diff --git a/chrome/browser/extensions/external_registry_loader_win.cc b/chrome/browser/extensions/external_registry_loader_win.cc
index 040869a9e6fcbf95d6989e7bf2f9652035d302d1..2d534d9d7af75d6f5197f6786c55fe17e4b4704a 100644
--- a/chrome/browser/extensions/external_registry_loader_win.cc
+++ b/chrome/browser/extensions/external_registry_loader_win.cc
@@ -54,7 +54,7 @@ void ExternalRegistryLoader::StartLoading() {
 void ExternalRegistryLoader::LoadOnFileThread() {
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   base::TimeTicks start_time = base::TimeTicks::Now();
-  scoped_ptr<DictionaryValue> prefs(new DictionaryValue);
+  scoped_ptr<base::DictionaryValue> prefs(new base::DictionaryValue);
 
   // A map of IDs, to weed out duplicates between HKCU and HKLM.
   std::set<base::string16> keys;