[Android] Remove the workaround code of a platform bug.

base/android/javatests/src/org/chromium/base/LibraryLoaderHelperTest.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.base;
-
-import android.content.Context;
-import android.test.InstrumentationTestCase;
-import android.test.suitebuilder.annotation.MediumTest;
-
-import org.chromium.base.library_loader.LibraryLoaderHelper;
-
-import java.io.File;
-
-/**
- * Test class for the native library hack.
- */
-public class LibraryLoaderHelperTest extends InstrumentationTestCase {
-    private static final String TAG = "LibraryLoaderHelperTest";
-
-    @Override
-    public void setUp() throws Exception {
-        Context context = getInstrumentation().getTargetContext();
-        LibraryLoaderHelper.deleteLibrariesSynchronously(
-                context, LibraryLoaderHelper.PACKAGE_MANAGER_WORKAROUND_DIR);
-    }
-
-    @MediumTest
-    public void testLoadNativeLibraries() {
-        getInstrumentation().runOnMainSync(new Runnable() {
-            @Override
-            public void run() {
-                Context context = getInstrumentation().getTargetContext();
-                File libDir = LibraryLoaderHelper.getLibDir(context,
-                        LibraryLoaderHelper.PACKAGE_MANAGER_WORKAROUND_DIR);
-                assertTrue(libDir.exists());
-                assertTrue(libDir.isDirectory());
-                assertEquals(libDir.list().length, 0);
-
-                assertTrue(LibraryLoaderHelper.loadNativeLibrariesUsingWorkaroundForTesting(
-                        context));
-
-                assertTrue(libDir.list().length > 0);
-            }
-        });
-    }
-
-    @Override
-    public void tearDown() throws Exception {
-        Context context = getInstrumentation().getTargetContext();
-        LibraryLoaderHelper.deleteLibrariesSynchronously(
-                context, LibraryLoaderHelper.PACKAGE_MANAGER_WORKAROUND_DIR);
-        super.tearDown();
-    }
-}