[Android] Enable multidex for release builds of chrome_public_test_apk.

base/android/java/src/org/chromium/base/BaseChromiumApplication.java

 // Copyright 2013 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.base;
 
 import android.app.Activity;
 import android.app.Application;
 import android.content.Context;
 import android.os.Bundle;
@@ skipping 26 matching lines @@
 
     protected BaseChromiumApplication(boolean shouldInitializeApplicationStatusTracking) {
         mShouldInitializeApplicationStatusTracking = shouldInitializeApplicationStatusTracking;
     }
 
     @Override
     protected void attachBaseContext(Context base) {
         super.attachBaseContext(base);
         assert getBaseContext() != null;
         checkAppBeingReplaced();
-        ChromiumMultiDexInstaller.install(this);
+        if (BuildConfig.isMultidexEnabled()) {
+            ChromiumMultiDexInstaller.install(this);
+        }
     }
 
     /**
      * Interface to be implemented by listeners for window focus events.
      */
     public interface WindowFocusChangedListener {
         /**
          * Called when the window focus changes for {@code activity}.
          * @param activity The {@link Activity} that has a window focus changed event.
          * @param hasFocus Whether or not {@code activity} gained or lost focus.
@@ skipping 173 matching lines @@
                     assert (Proxy.isProxyClass(activity.getWindow().getCallback().getClass())
                             || activity.getWindow().getCallback().getClass().getName().equals(
                                     TOOLBAR_CALLBACK_WRAPPER_CLASS)
                             || activity.getWindow().getCallback().getClass().getName().equals(
                                     TOOLBAR_CALLBACK_INTERNAL_WRAPPER_CLASS));
                 }
             }
         });
     }
 }