[BackgroundSync] Move read and write of shared preferences to an AsyncTask

content/browser/android/background_sync_launcher_android.cc

Index: content/browser/android/background_sync_launcher_android.cc
diff --git a/content/browser/android/background_sync_launcher_android.cc b/content/browser/android/background_sync_launcher_android.cc
index 78110c14f6428b08b9ca0ed3d22bb20418bfa00b..693817baa8a8174bad383aac37131c9531a0603e 100644
--- a/content/browser/android/background_sync_launcher_android.cc
+++ b/content/browser/android/background_sync_launcher_android.cc
@@ -46,7 +46,8 @@ void BackgroundSyncLauncherAndroid::LaunchBrowserWhenNextOnlineImpl(
   if (was_launching != now_launching) {
     JNIEnv* env = base::android::AttachCurrentThread();
     Java_BackgroundSyncLauncher_setLaunchWhenNextOnline(
-        env, java_launcher_.obj(), now_launching);
+        env, java_launcher_.obj(), base::android::GetApplicationContext(),
+        now_launching);
   }
 }