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

chrome/browser/performance_monitor/performance_monitor_browsertest.cc

Index: chrome/browser/performance_monitor/performance_monitor_browsertest.cc
diff --git a/chrome/browser/performance_monitor/performance_monitor_browsertest.cc b/chrome/browser/performance_monitor/performance_monitor_browsertest.cc
index 0fa6655ce5e8e7899e94c663f25171b0cf0ebcd3..985baabac9f455dcd0fe1717011c51c93f32fa29 100644
--- a/chrome/browser/performance_monitor/performance_monitor_browsertest.cc
+++ b/chrome/browser/performance_monitor/performance_monitor_browsertest.cc
@@ -85,7 +85,7 @@ struct ExtensionBasicInfo {
 // Compare the fields of |extension| to those in |value|; this is a check to
 // make sure the extension data was recorded properly in the event.
 void ValidateExtensionInfo(const ExtensionBasicInfo extension,
-                           const DictionaryValue* value) {
+                           const base::DictionaryValue* value) {
   std::string extension_description;
   std::string extension_id;
   std::string extension_name;