Execute operations of ChildProcessLauncher on launcher thread

chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java

Index: chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
index 4b2d4ebcd10e8ed9cec8b173399ca6dd9f7582a1..1c8cdecc4f760e140eb649a861925fc9273326de 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
@@ -15,7 +15,6 @@ import android.content.res.Resources;
 import android.graphics.Point;
 import android.net.ConnectivityManager;
 import android.net.Uri;
-import android.os.AsyncTask;
 import android.os.Binder;
 import android.os.Build;
 import android.os.Bundle;
@@ -276,14 +275,8 @@ public class CustomTabsConnection extends ICustomTabsService.Stub {
                     // dialog to the user.
                     System.exit(-1);
                 }
-                final Context context = app.getApplicationContext();
-                new AsyncTask<Void, Void, Void>() {
-                    @Override
-                    protected Void doInBackground(Void... params) {
-                        ChildProcessLauncher.warmUp(context);
-                        return null;
-                    }
-                }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
+                Context context = app.getApplicationContext();
+                ChildProcessLauncher.warmUp(context);
                 ChromeBrowserInitializer.initNetworkChangeNotifier(context);
                 WarmupManager.getInstance().initializeViewHierarchy(app.getApplicationContext(),
                         R.style.MainTheme, R.layout.main, R.id.control_container_stub,