Remove unnecesary usage of RefPtr and PassRefPtr of DatabaseContext.

Source/modules/webdatabase/DatabaseSync.cpp

Index: Source/modules/webdatabase/DatabaseSync.cpp
diff --git a/Source/modules/webdatabase/DatabaseSync.cpp b/Source/modules/webdatabase/DatabaseSync.cpp
index 7c4297406792d6fe12d83ff4d646e6622cddd36c..0b249873461a99ad81e94d1425d234381cee041e 100644
--- a/Source/modules/webdatabase/DatabaseSync.cpp
+++ b/Source/modules/webdatabase/DatabaseSync.cpp
@@ -53,9 +53,9 @@ PassRefPtrWillBeRawPtr<DatabaseSync> DatabaseSync::create(ExecutionContext*, Pas
     return static_cast<DatabaseSync*>(backend.get());
 }
 
-DatabaseSync::DatabaseSync(PassRefPtr<DatabaseContext> databaseContext,
+DatabaseSync::DatabaseSync(DatabaseContext* databaseContext,
     const String& name, const String& expectedVersion, const String& displayName, unsigned long estimatedSize)
-    : DatabaseBackendSync(databaseContext.get(), name, expectedVersion, displayName, estimatedSize)
+    : DatabaseBackendSync(databaseContext, name, expectedVersion, displayName, estimatedSize)
     , DatabaseBase(databaseContext->executionContext())
 {
     ScriptWrappable::init(this);