Revert of [Android] Add gyp support for multidex.

base/android/java/src/org/chromium/base/annotations/MainDex.java

Index: base/android/java/src/org/chromium/base/annotations/MainDex.java
diff --git a/base/android/java/src/org/chromium/base/annotations/MainDex.java b/base/android/java/src/org/chromium/base/annotations/MainDex.java
deleted file mode 100644
index 0b35ade8ee62de8b33a5e75068927a1c431bb1bd..0000000000000000000000000000000000000000
--- a/base/android/java/src/org/chromium/base/annotations/MainDex.java
+++ /dev/null
@@ -1,21 +0,0 @@
-// 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.annotations;
-
-import java.lang.annotation.ElementType;
-import java.lang.annotation.Retention;
-import java.lang.annotation.RetentionPolicy;
-import java.lang.annotation.Target;
-
-/**
- * An annotation that signals that a class should be kept in the main dex file.
- *
- * This generally means it's used by renderer processes, which can't load secondary dexes
- * on K and below.
- */
-@Target(ElementType.TYPE)
-@Retention(RetentionPolicy.CLASS)
-public @interface MainDex {
-}