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

chrome/browser/android/offline_pages/offline_page_bridge.cc

 // 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 "chrome/browser/android/offline_pages/offline_page_bridge.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/android/jni_array.h"
@@ skipping 143 matching lines @@
                             const JavaParamRef<jstring>& j_url) {
   GURL url(ConvertJavaStringToUTF8(env, j_url));
   return url.is_valid() && OfflinePageModel::CanSavePage(url);
 }
 
 static ScopedJavaLocalRef<jobject> GetOfflinePageBridgeForProfile(
     JNIEnv* env,
     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());
 }
 
 OfflinePageBridge::OfflinePageBridge(JNIEnv* env,
                                      content::BrowserContext* browser_context,
                                      OfflinePageModel* offline_page_model)
     : browser_context_(browser_context),
       offline_page_model_(offline_page_model) {
   ScopedJavaLocalRef<jobject> j_offline_page_bridge =
       Java_OfflinePageBridge_create(env, reinterpret_cast<jlong>(this));
@@ skipping 224 matching lines @@
       ConvertUTF8ToJavaString(env, client_id.name_space).obj(),
       ConvertUTF8ToJavaString(env, client_id.id).obj());
 }
 
 bool RegisterOfflinePageBridge(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 }  // namespace offline_pages