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

chrome/browser/extensions/webstore_standalone_installer.h

Index: chrome/browser/extensions/webstore_standalone_installer.h
diff --git a/chrome/browser/extensions/webstore_standalone_installer.h b/chrome/browser/extensions/webstore_standalone_installer.h
index a713f1d7849bd0fc3dde80fed50efe51cbcff3fa..b515cb09cc8d0452972a493a718247e0b89ff033 100644
--- a/chrome/browser/extensions/webstore_standalone_installer.h
+++ b/chrome/browser/extensions/webstore_standalone_installer.h
@@ -135,7 +135,7 @@ class WebstoreStandaloneInstaller
   }
   Profile* profile() const { return profile_; }
   const std::string& id() const { return id_; }
-  const DictionaryValue* manifest() const { return manifest_.get(); }
+  const base::DictionaryValue* manifest() const { return manifest_.get(); }
 
  private:
   friend class base::RefCountedThreadSafe<WebstoreStandaloneInstaller>;
@@ -206,8 +206,8 @@ class WebstoreStandaloneInstaller
   std::string localized_user_count_;
   double average_rating_;
   int rating_count_;
-  scoped_ptr<DictionaryValue> webstore_data_;
-  scoped_ptr<DictionaryValue> manifest_;
+  scoped_ptr<base::DictionaryValue> webstore_data_;
+  scoped_ptr<base::DictionaryValue> manifest_;
   SkBitmap icon_;
 
   // Created by ShowInstallUI() when a prompt is shown (if