Generate ChromeVersionConstants.java at build time.

chrome/android/java/src/org/chromium/chrome/browser/BrowserVersion.java

 // Copyright 2014 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;
 
 /**
  * TODO(nileshagrawal): Rename this class to something more appropriate.
  * Provides a way for java code to determine whether Chrome was built as an official build.
  */
 public class BrowserVersion {
     /**
      * Check if the browser was built as an "official" build.
      *
      * This function depends on the native library being loaded; calling it before then will crash.
      */
     public static boolean isOfficialBuild() {
-        return nativeIsOfficialBuild();
+        return ChromeVersionConstants.IS_OFFICIAL_BUILD;
     }
-
-    private static native boolean nativeIsOfficialBuild();
 }