Replace deprecated Android java test annotations

chrome/android/javatests/src/org/chromium/chrome/browser/tabmodel/MultiInstanceMigrationTest.java

 // Copyright 2016 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.chrome.browser.tabmodel;
 
 import android.content.Context;
+import android.support.test.filters.MediumTest;
 import android.test.InstrumentationTestCase;
-import android.test.suitebuilder.annotation.MediumTest;
 
 import org.chromium.base.ContextUtils;
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.test.util.AdvancedMockContext;
 import org.chromium.base.test.util.Feature;
 import org.chromium.chrome.browser.TabState;
 import org.chromium.chrome.test.util.ApplicationData;
 import org.chromium.chrome.test.util.browser.tabmodel.MockTabModelSelector;
 
 import java.io.File;
@@ skipping 312 matching lines @@
                     Integer.toString(TabModelSelectorImpl.CUSTOM_TABS_SELECTOR_INDEX));
             if (!stateDirs[numDirsToCreate - 1].exists()) {
                 assertTrue("Could not create custom tab state dir",
                         stateDirs[numDirsToCreate - 1].mkdir());
             }
         }
 
         return stateDirs;
     }
 }