Fix up _some_web app directory StrictMode violations

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

 // 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.chrome.browser.tabmodel;
 
 import android.content.Context;
 import android.util.Base64;
 
+import org.chromium.base.FileUtils;
 import org.chromium.base.Log;
 import org.chromium.base.StreamUtil;
 
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 
 /**
  * Creates and fills up a directory with data suitable for testing code related to {@link TabModel}.
  * Used for mocking out the real data directory.
@@ skipping 186 matching lines @@
      * @param context Context to use.
      * @param baseDirectoryName Name of the directory to store test data in.
      * @param subdirectoryName Subdirectory of the base directory.  May be null, in which case the
      *                         baseDirectoryName will store the data.  This mocks out how the
      *                         ChromeTabbedActivity instances all store their data in different
      *                         subdirectories of the base data directory.
      */
     public TestTabModelDirectory(
             Context context, String baseDirectoryName, String subdirectoryName) throws Exception {
         mTestingDirectory = new File(context.getCacheDir(), baseDirectoryName);
-        if (mTestingDirectory.exists()) recursivelyDelete(mTestingDirectory);
+        if (mTestingDirectory.exists()) FileUtils.recursivelyDeleteFile(mTestingDirectory);
         if (!mTestingDirectory.mkdirs()) {
             Log.e(TAG, "Failed to create: " + mTestingDirectory.getName());
         }
 
         // Create the subdirectory.
         File dataDirectory = mTestingDirectory;
         if (subdirectoryName != null) {
             dataDirectory = new File(mTestingDirectory, subdirectoryName);
             if (!dataDirectory.exists() && !dataDirectory.mkdirs()) {
                 Log.e(TAG, "Failed to create subdirectory: " + dataDirectory.getName());
             }
         }
 
         // Fill the subdirectory with mocked pre-generated TabState files and metadata for the
         // TabPersistentStore.
         writeFile(dataDirectory, "tab_state", TAB_MODEL_METADATA_V4);
         writeFile(dataDirectory, M18_NTP.filename, M18_NTP.encodedTabState);
         writeFile(dataDirectory, M26_GOOGLE_COM.filename, M26_GOOGLE_COM.encodedTabState);
         writeFile(dataDirectory, M18_GOOGLE_COM.filename, M18_GOOGLE_COM.encodedTabState);
         writeFile(dataDirectory, M26_GOOGLE_CA.filename, M26_GOOGLE_CA.encodedTabState);
         writeFile(dataDirectory, V2_BAIDU.filename, V2_BAIDU.encodedTabState);
         writeFile(dataDirectory, V2_DUCK_DUCK_GO.filename, V2_DUCK_DUCK_GO.encodedTabState);
         writeFile(dataDirectory, V2_HAARETZ.filename, V2_HAARETZ.encodedTabState);
         writeFile(dataDirectory, V2_TEXTAREA.filename, V2_TEXTAREA.encodedTabState);
     }
 
     /** Nukes all the testing data. */
     public void tearDown() throws Exception {
-        recursivelyDelete(mTestingDirectory);
+        FileUtils.recursivelyDeleteFile(mTestingDirectory);
     }
 
     /** Returns the base data directory. */
     public File getBaseDirectory() {
         return mTestingDirectory;
     }
 
     private void writeFile(File directory, String filename, String data) throws Exception {
         File file = new File(directory, filename);
         FileOutputStream outputStream = null;
         try {
             outputStream = new FileOutputStream(file);
             outputStream.write(Base64.decode(data, 0));
         } catch (FileNotFoundException e) {
             assert false : "Failed to create " + filename;
         } finally {
             StreamUtil.closeQuietly(outputStream);
         }
     }
-
-    private void recursivelyDelete(File currentFile) throws Exception {
-        if (currentFile.isDirectory()) {
-            File[] files = currentFile.listFiles();
-            if (files != null) {
-                for (File file : files) {
-                    recursivelyDelete(file);
-                }
-            }
-        }
-
-        if (!currentFile.delete()) Log.e(TAG, "Failed to delete: " + currentFile);
-    }
 }