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

chrome/browser/performance_monitor/database.cc

Index: chrome/browser/performance_monitor/database.cc
diff --git a/chrome/browser/performance_monitor/database.cc b/chrome/browser/performance_monitor/database.cc
index 4d34ef28057f5bdcdb6987e3ef77302dabe2a8dc..bd2f432c38cd6d7057de57705798dd9f9d9d9d8b 100644
--- a/chrome/browser/performance_monitor/database.cc
+++ b/chrome/browser/performance_monitor/database.cc
@@ -57,12 +57,12 @@ double StringToDouble(const std::string& s) {
 // Returns an event from the given JSON string; the scoped_ptr will be NULL if
 // we are unable to properly parse the JSON.
 scoped_ptr<Event> EventFromJSON(const std::string& data) {
-  Value* value = base::JSONReader::Read(data);
-  DictionaryValue* dict = NULL;
+  base::Value* value = base::JSONReader::Read(data);
+  base::DictionaryValue* dict = NULL;
   if (!value || !value->GetAsDictionary(&dict))
     return scoped_ptr<Event>();
 
-  return Event::FromValue(scoped_ptr<DictionaryValue>(dict));
+  return Event::FromValue(scoped_ptr<base::DictionaryValue>(dict));
 }
 
 }  // namespace