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

chrome/browser/guestview/guestview.h

Index: chrome/browser/guestview/guestview.h
diff --git a/chrome/browser/guestview/guestview.h b/chrome/browser/guestview/guestview.h
index 8b6e03b73087c1e70c33604873a43d7dc42b7ba1..46485840a62a5b616aa07ee4e700bc82360060c2 100644
--- a/chrome/browser/guestview/guestview.h
+++ b/chrome/browser/guestview/guestview.h
@@ -29,16 +29,16 @@ class GuestView : public content::BrowserPluginGuestDelegate {
 
   class Event {
    public:
-     Event(const std::string& name, scoped_ptr<DictionaryValue> args);
+     Event(const std::string& name, scoped_ptr<base::DictionaryValue> args);
      ~Event();
 
     const std::string& name() const { return name_; }
 
-    scoped_ptr<DictionaryValue> GetArguments();
+    scoped_ptr<base::DictionaryValue> GetArguments();
 
    private:
     const std::string name_;
-    scoped_ptr<DictionaryValue> args_;
+    scoped_ptr<base::DictionaryValue> args_;
   };
 
   static Type GetViewTypeFromString(const std::string& api_type);