Disable access to secondary dex files.

build/android/incremental_install/java/org/chromium/incrementalinstall/BootstrapApplication.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.incrementalinstall;
 
 import android.app.Application;
 import android.app.Instrumentation;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.NameNotFoundException;
 import android.os.Bundle;
 import android.util.Log;
 
+import org.chromium.base.Reflect;
+
 import java.io.File;
 import java.lang.ref.WeakReference;
 import java.util.List;
 import java.util.Map;
 
 /**
  * An Application that replaces itself with another Application (as defined in
  * an AndroidManifext.xml meta-data tag). It loads the other application only
  * after side-loading its .so and .dex files from /data/local/tmp.
  *
@@ skipping 246 matching lines @@
             for (Map.Entry<String, WeakReference<?>> entry : packageMap.entrySet()) {
                 Object loadedApk = entry.getValue().get();
                 if (loadedApk != null && Reflect.getField(loadedApk, "mApplication") == this) {
                     Reflect.setField(loadedApk, "mApplication", mRealApplication);
                     Reflect.setField(mRealApplication, "mLoadedApk", loadedApk);
                 }
             }
         }
     }
 }