Revert of Android: Switch to thread pool executor

chrome/browser/android/background_sync_launcher_android.cc

Index: chrome/browser/android/background_sync_launcher_android.cc
diff --git a/chrome/browser/android/background_sync_launcher_android.cc b/chrome/browser/android/background_sync_launcher_android.cc
index bac2de677419792743d4c45f3cd3a030f3177a5e..0b13a145d69b3432434bd87b96868142b8e5913f 100644
--- a/chrome/browser/android/background_sync_launcher_android.cc
+++ b/chrome/browser/android/background_sync_launcher_android.cc
@@ -44,7 +44,8 @@
 
   JNIEnv* env = base::android::AttachCurrentThread();
   Java_BackgroundSyncLauncher_launchBrowserIfStopped(
-      env, java_launcher_, launch_when_next_online, min_delay_ms);
+      env, java_launcher_, base::android::GetApplicationContext(),
+      launch_when_next_online, min_delay_ms);
 }
 
 // static