PrivateScriptRunner::installClassIfNeeded should not run for a null frame

third_party/WebKit/Source/bindings/core/v8/PrivateScriptRunner.cpp

Index: third_party/WebKit/Source/bindings/core/v8/PrivateScriptRunner.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/PrivateScriptRunner.cpp b/third_party/WebKit/Source/bindings/core/v8/PrivateScriptRunner.cpp
index 24e1cdf10105ae3604bb0f05620784c4f51da439..3f0c2b2099113123c4bf7f9ac4ebadcd51b489e0 100644
--- a/third_party/WebKit/Source/bindings/core/v8/PrivateScriptRunner.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/PrivateScriptRunner.cpp
@@ -228,6 +228,9 @@ static void initializeHolderIfNeeded(ScriptState* scriptState, v8::Local<v8::Obj
 
 v8::Local<v8::Value> PrivateScriptRunner::installClassIfNeeded(Document* document, String className)
 {
+    if (!document->contextDocument()->frame())
+        return v8::Local<v8::Value>();
+
     v8::HandleScope handleScope(toIsolate(document));
     ScriptState* scriptState = ScriptState::forWorld(document->contextDocument()->frame(), DOMWrapperWorld::privateScriptIsolatedWorld());
     if (!scriptState->contextIsValid())