[Android] Enable multidex for debug builds of ChromePublic.

base/android/java/templates/ChromiumMultiDex.template

 // 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.base.multidex;
 
 import android.content.Context;
 import android.os.Build;
 import android.os.Process;
 import android.support.multidex.MultiDex;
@@ skipping 12 matching lines @@
 
     /**
      *  Installs secondary dexes if possible.
      *
      *  Isolated processes (e.g. renderer processes) can't load secondary dex files on
      *  K and below, so we don't even try in that case.
      *
      *  @param context The application context.
      */
     @VisibleForTesting
+#if defined(CONFIGURATION_NAME_Debug)
     public static void install(Context context) {
         try {
             // TODO(jbudorick): Back out this version check once support for K & below works.
             // http://crbug.com/512357
             if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP && processIsIsolated()) {
                 Log.i(TAG, "Skipping multidex installation: inside isolated process.");
             } else {
                 MultiDex.install(context);
                 Log.i(TAG, "Completed multidex installation.");
             }
         } catch (NoSuchMethodException e) {
             Log.wtf(TAG, "Failed multidex installation", e);
         } catch (IllegalAccessException e) {
             Log.wtf(TAG, "Failed multidex installation", e);
         } catch (InvocationTargetException e) {
             Log.wtf(TAG, "Failed multidex installation", e);
         }
     }
 
     // Calls Process.isIsolated, a private Android API.
     private static boolean processIsIsolated()
             throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
         return (boolean) Process.class.getMethod("isIsolated").invoke(null);
     }
+#else
+    public static void install(Context context) {
+    }
+#endif
 
 }