Add missing null check in Database::getSecurityOrigin()

third_party/WebKit/Source/modules/webdatabase/Database.cpp

Index: third_party/WebKit/Source/modules/webdatabase/Database.cpp
diff --git a/third_party/WebKit/Source/modules/webdatabase/Database.cpp b/third_party/WebKit/Source/modules/webdatabase/Database.cpp
index 3f3b630df32067a79dd643ac02a1637db06e425f..717616678e8afad4c1b992fda9a3d369530ecd1a 100644
--- a/third_party/WebKit/Source/modules/webdatabase/Database.cpp
+++ b/third_party/WebKit/Source/modules/webdatabase/Database.cpp
@@ -897,11 +897,13 @@ Vector<String> Database::tableNames()
 
 SecurityOrigin* Database::getSecurityOrigin() const
 {
+    if (!getExecutionContext())
+        return nullptr;
     if (getExecutionContext()->isContextThread())
         return m_contextThreadSecurityOrigin.get();
     if (getDatabaseContext()->databaseThread()->isDatabaseThread())
         return m_databaseThreadSecurityOrigin.get();
-    return 0;
+    return nullptr;
 }
 
 bool Database::opened()