Check for the default search engine being null before using.

chrome/browser/search_engines/template_url_service_android.h

 // Copyright (c) 2013 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.
 
 #ifndef CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_SERVICE_ANDROID_H_
 #define CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_SERVICE_ANDROID_H_
 
 #include <memory>
 
 #include "base/android/jni_weak_ref.h"
@@ skipping 25 matching lines @@
   jint GetTemplateUrlCount(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj) const;
   jboolean IsLoaded(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj) const;
   base::android::ScopedJavaLocalRef<jobject> GetTemplateUrlAt(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj,
       jint index) const;
-  jboolean IsSearchProviderManaged(
+  jboolean IsDefaultSearchManaged(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj);
   jboolean IsSearchByImageAvailable(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj);
   jboolean IsDefaultSearchEngineGoogle(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj);
   jboolean IsSearchResultsPageFromDefaultSearchProvider(
       JNIEnv* env,
@@ skipping 63 matching lines @@
   std::unique_ptr<TemplateURLService::Subscription> template_url_subscription_;
 
   // Caches the up-to-date TemplateURL list so that calls from Android could
   // directly get data from it.
   std::vector<TemplateURL*> template_urls_;
 
   DISALLOW_COPY_AND_ASSIGN(TemplateUrlServiceAndroid);
 };
 
 #endif  // CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_SERVICE_ANDROID_H_