Remove ChromePrerenderService, keeping only its skeleton behind.

chrome/android/java/src/org/chromium/chrome/browser/prerender/ChromePrerenderService.java

 // 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.
 
 package org.chromium.chrome.browser.prerender;
 
 import android.app.Service;
 import android.content.Context;
 import android.content.Intent;
-import android.os.AsyncTask;
 import android.os.IBinder;
 import android.os.Message;
 import android.os.Messenger;
-import android.text.TextUtils;
-import android.util.Log;
 
-import org.chromium.base.ThreadUtils;
-import org.chromium.base.annotations.SuppressFBWarnings;
-import org.chromium.base.library_loader.ProcessInitException;
-import org.chromium.chrome.R;
-import org.chromium.chrome.browser.ApplicationInitialization;
-import org.chromium.chrome.browser.ChromeApplication;
 import org.chromium.chrome.browser.ChromeVersionInfo;
-import org.chromium.chrome.browser.WarmupManager;
 import org.chromium.chrome.browser.externalauth.ExternalAuthUtils;
 import org.chromium.chrome.browser.externalauth.VerifiedHandler;
-import org.chromium.chrome.browser.init.ChromeBrowserInitializer;
-import org.chromium.content.browser.ChildProcessCreationParams;
-import org.chromium.content.browser.ChildProcessLauncher;
 
 /**
- * A bound service that warms up Chrome and performs actions related with prerendering urls.
+ * A bound service that does nothing. Kept here to prevent old clients relying on it being
+ * available from crashing.
  */
 public class ChromePrerenderService extends Service {
-    public static final int MSG_PRERENDER_URL = 1;
-    public static final int MSG_CANCEL_PRERENDER = 2;
-    public static final String KEY_PRERENDERED_URL = "url_to_prerender";
-    public static final String KEY_PRERENDER_WIDTH = "prerender_width";
-    public static final String KEY_PRERENDER_HEIGHT = "prerender_height";
-    public static final String KEY_REFERRER = "referrer";
-
     /**
      * Handler of incoming messages from clients.
      */
-    class IncomingHandler extends VerifiedHandler {
+    static class IncomingHandler extends VerifiedHandler {
         IncomingHandler(Context context) {
             super(context, ChromeVersionInfo.isLocalBuild()
                     ? 0 : ExternalAuthUtils.FLAG_SHOULD_BE_GOOGLE_SIGNED);
         }
 
         @Override
-        public void handleMessage(Message msg) {
-            ChromePrerenderService.this.handleMessage(msg);
-        }
+        public void handleMessage(Message msg) {}
     }
 
-    /**
-     * Target we publish for clients to send messages to IncomingHandler.
-     */
     private Messenger mMessenger;
 
-    /**
-     * When binding to the service, we return an interface to our messenger
-     * for sending messages to the service.
-     */
-    @SuppressFBWarnings("DM_EXIT")
     @Override
     public IBinder onBind(Intent intent) {
         mMessenger = new Messenger(new IncomingHandler(getApplicationContext()));
-
-        try {
-            final Context context = getApplicationContext();
-            final ChromeApplication chrome = (ChromeApplication) context;
-            ChildProcessCreationParams.set(chrome.getChildProcessCreationParams());
-            new AsyncTask<Context, Void, Void>() {
-                @Override
-                protected Void doInBackground(Context... params) {
-                    ChildProcessLauncher.warmUp(params[0]);
-                    return null;
-                }
-            }.execute(context);
-            ChromeBrowserInitializer.getInstance(this).handleSynchronousStartup();
-
-            ApplicationInitialization.enableFullscreenFlags(
-                    getApplicationContext().getResources(),
-                    getApplicationContext(), R.dimen.control_container_height);
-        } catch (ProcessInitException e) {
-            Log.e(this.getClass().toString(),
-                    "ProcessInitException while starting the browser process");
-            // Since the library failed to initialize nothing in the application
-            // can work, so kill the whole application not just the activity
-            System.exit(-1);
-        }
         return mMessenger.getBinder();
     }
-
-    /**
-     * Handle and incoming message from the messenger. Child classes adding new messages
-     * should extend this call and handle them separately.
-     * @param msg The message to be handled.
-     */
-    protected void handleMessage(Message msg) {
-        switch (msg.what) {
-            case MSG_PRERENDER_URL:
-                final String url = msg.getData().getString(KEY_PRERENDERED_URL);
-                final String referrer = msg.getData().getString(KEY_REFERRER, "");
-                final int width = msg.getData().getInt(KEY_PRERENDER_WIDTH, 0);
-                final int height = msg.getData().getInt(KEY_PRERENDER_HEIGHT, 0);
-                if (!TextUtils.isEmpty(url)) {
-                    ThreadUtils.runOnUiThread(new Runnable() {
-                        @Override
-                        public void run() {
-                            prerenderUrl(url, referrer, width, height);
-                        }
-                    });
-                }
-                break;
-            case MSG_CANCEL_PRERENDER:
-                ThreadUtils.runOnUiThread(new Runnable() {
-                    @Override
-                    public void run() {
-                        WarmupManager.getInstance().cancelCurrentPrerender();
-                    }
-                });
-                break;
-            default:
-                break;
-        }
-    }
-
-    private void prerenderUrl(String url, String referrer, int width, int height) {
-        WarmupManager.getInstance().prerenderUrl(url, referrer, width, height);
-    }
 }