PagePopupController: handle frame-detached window usage.

third_party/WebKit/Source/bindings/core/v8/V8PagePopupControllerBinding.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "bindings/core/v8/V8PagePopupControllerBinding.h"
 
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/core/v8/V8Window.h"
 #include "core/dom/ContextFeatures.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/page/PagePopupController.h"
 #include "core/page/PagePopupSupplement.h"
 #include "platform/instrumentation/tracing/TraceEvent.h"
 
 namespace blink {
 
 namespace {
 
 void pagePopupControllerAttributeGetter(
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   v8::Local<v8::Object> holder = info.Holder();
   DOMWindow* impl = V8Window::toImpl(holder);
-  PagePopupController* cppValue =
-      PagePopupSupplement::from(*toLocalDOMWindow(impl)->frame())
-          .pagePopupController();
+  PagePopupController* cppValue = nullptr;
+  if (LocalFrame* frame = toLocalDOMWindow(impl)->frame())
+    cppValue = PagePopupSupplement::from(*frame).pagePopupController();
   v8SetReturnValue(info, ToV8(cppValue, holder, info.GetIsolate()));
 }
 
 void pagePopupControllerAttributeGetterCallback(
     v8::Local<v8::Name>,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   pagePopupControllerAttributeGetter(info);
 }
 
 }  // namespace
 
 void V8PagePopupControllerBinding::installPagePopupController(
     v8::Local<v8::Context> context,
     v8::Local<v8::Object> windowWrapper) {
   ExecutionContext* executionContext =
       toExecutionContext(windowWrapper->CreationContext());
   if (!(executionContext && executionContext->isDocument() &&
         ContextFeatures::pagePopupEnabled(toDocument(executionContext))))
     return;
 
   windowWrapper->SetAccessor(
       context, v8AtomicString(context->GetIsolate(), "pagePopupController"),
       pagePopupControllerAttributeGetterCallback).ToChecked();
 }
 
 }  // namespace blink