Offline Pages: Add NULL-checks for when the model is NULL (incognito mode)

chrome/browser/android/offline_pages/offline_page_bridge.cc

Index: chrome/browser/android/offline_pages/offline_page_bridge.cc
diff --git a/chrome/browser/android/offline_pages/offline_page_bridge.cc b/chrome/browser/android/offline_pages/offline_page_bridge.cc
index 6c229f4eb013f64f7feedee2de1999de037c95c1..62116b938c6208bf4638727fbe8aa30d342a5fb1 100644
--- a/chrome/browser/android/offline_pages/offline_page_bridge.cc
+++ b/chrome/browser/android/offline_pages/offline_page_bridge.cc
@@ -161,15 +161,20 @@ static ScopedJavaLocalRef<jobject> GetOfflinePageBridgeForProfile(
     const JavaParamRef<jclass>& jcaller,
     const JavaParamRef<jobject>& j_profile) {
   Profile* profile = ProfileAndroid::FromProfileAndroid(j_profile);
+
   OfflinePageModel* offline_page_model =
       OfflinePageModelFactory::GetForBrowserContext(profile);
 
+  if (offline_page_model == nullptr)
+    return ScopedJavaLocalRef<jobject>();
+
   OfflinePageBridge* bridge = static_cast<OfflinePageBridge*>(
       offline_page_model->GetUserData(kOfflinePageBridgeKey));
   if (!bridge) {
     bridge = new OfflinePageBridge(env, profile, offline_page_model);
     offline_page_model->SetUserData(kOfflinePageBridgeKey, bridge);
   }
+
   return ScopedJavaLocalRef<jobject>(bridge->java_ref());
 }