Split Dictionary's get and convert into DictionaryHelper.

Source/modules/indexeddb/IDBObjectStore.cpp

Index: Source/modules/indexeddb/IDBObjectStore.cpp
diff --git a/Source/modules/indexeddb/IDBObjectStore.cpp b/Source/modules/indexeddb/IDBObjectStore.cpp
index c7b46bab9b8d392fea5e37dae140ff933afb0480..ed8ec9ae2ff2f7504449ac09c3908d8e77228bff 100644
--- a/Source/modules/indexeddb/IDBObjectStore.cpp
+++ b/Source/modules/indexeddb/IDBObjectStore.cpp
@@ -26,6 +26,8 @@
 #include "config.h"
 #include "modules/indexeddb/IDBObjectStore.h"
 
+#include "bindings/core/v8/Dictionary.h"
+#include "bindings/core/v8/DictionaryHelper.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "bindings/core/v8/ScriptState.h"
@@ -386,10 +388,10 @@ private:
 IDBIndex* IDBObjectStore::createIndex(ScriptState* scriptState, const String& name, const IDBKeyPath& keyPath, const Dictionary& options, ExceptionState& exceptionState)
 {
     bool unique = false;
-    options.get("unique", unique);
+    DictionaryHelper::get(options, "unique", unique);
 
     bool multiEntry = false;
-    options.get("multiEntry", multiEntry);
+    DictionaryHelper::get(options, "multiEntry", multiEntry);
 
     return createIndex(scriptState, name, keyPath, unique, multiEntry, exceptionState);
 }