IDL: make optional arguments (without default) explicit sometimes

Source/modules/indexeddb/IDBFactory.cpp

Index: Source/modules/indexeddb/IDBFactory.cpp
diff --git a/Source/modules/indexeddb/IDBFactory.cpp b/Source/modules/indexeddb/IDBFactory.cpp
index db08ff96b216029ee808ceab8ed1be94a11e66f5..161ab02423ed8705fa0f1915cda1999e08078ab4 100644
--- a/Source/modules/indexeddb/IDBFactory.cpp
+++ b/Source/modules/indexeddb/IDBFactory.cpp
@@ -92,19 +92,15 @@ IDBRequest* IDBFactory::getDatabaseNames(ScriptState* scriptState, ExceptionStat
     return request;
 }
 
-IDBOpenDBRequest* IDBFactory::open(ScriptState* scriptState, const String& name, unsigned long long version, ExceptionState& exceptionState)
+IDBOpenDBRequest* IDBFactory::open(ScriptState* scriptState, const String& name, Optional<unsigned long long> optionalVersion, ExceptionState& exceptionState)
 {
     IDB_TRACE("IDBFactory::open");
+    Platform::current()->histogramEnumeration("WebCore.IndexedDB.FrontEndAPICalls", IDBOpenCall, IDBMethodsMax);
+    int64_t version = optionalVersion.isMissing() ? IDBDatabaseMetadata::NoIntVersion : optionalVersion.get();
     if (!version) {
         exceptionState.throwTypeError("The version provided must not be 0.");
         return 0;
     }
-    return openInternal(scriptState, name, version, exceptionState);
-}
-
-IDBOpenDBRequest* IDBFactory::openInternal(ScriptState* scriptState, const String& name, int64_t version, ExceptionState& exceptionState)
-{
-    Platform::current()->histogramEnumeration("WebCore.IndexedDB.FrontEndAPICalls", IDBOpenCall, IDBMethodsMax);
     ASSERT(version >= 1 || version == IDBDatabaseMetadata::NoIntVersion);
     if (name.isNull()) {
         exceptionState.throwTypeError("The name provided must not be empty.");
@@ -130,12 +126,6 @@ IDBOpenDBRequest* IDBFactory::openInternal(ScriptState* scriptState, const Strin
     return request;
 }
 
-IDBOpenDBRequest* IDBFactory::open(ScriptState* scriptState, const String& name, ExceptionState& exceptionState)
-{
-    IDB_TRACE("IDBFactory::open");
-    return openInternal(scriptState, name, IDBDatabaseMetadata::NoIntVersion, exceptionState);
-}
-
 IDBOpenDBRequest* IDBFactory::deleteDatabase(ScriptState* scriptState, const String& name, ExceptionState& exceptionState)
 {
     IDB_TRACE("IDBFactory::deleteDatabase");