Remove Files.fileTreeTraverser().

RELNOTES=`io`: Removed deprecated `Files.fileTreeTraverser()` and `MoreFiles.directoryTreeTraverser()`.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=194276111

Author: cgdecker

android/guava-tests/test/com/google/common/io/FileTreeTraverserTest.java

@@ -43,8 +43,7 @@
 /**
  * Unit test for {@link Files}.
  *
- * <p>Note: {@link Files#fileTreeTraverser()} is tested in {@link FileTreeTraverserTest} and {@link
- * Files#fileTraverser()} is tested in {@link FilesFileTraverserTest}.
+ * <p>Note: {@link Files#fileTraverser()} is tested in {@link FilesFileTraverserTest}.
  *
  * @author Chris Nokleberg
  */

android/guava-tests/test/com/google/common/io/FilesTest.java

@@ -802,11 +802,10 @@ public static String getNameWithoutExtension(String file) {
    *
    * @since 15.0
    * @deprecated The returned {@link TreeTraverser} type is deprecated. Use the replacement method
-   *     {@link #fileTraverser()} instead with the same semantics as this method. This method is
-   *     scheduled to be removed in April 2018.
+   *     {@link #fileTraverser()} instead with the same semantics as this method.
    */
   @Deprecated
-  public static TreeTraverser<File> fileTreeTraverser() {
+  static TreeTraverser<File> fileTreeTraverser() {
     return FILE_TREE_TRAVERSER;
   }
 

android/guava/src/com/google/common/io/Files.java

@@ -43,8 +43,7 @@
 /**
  * Unit test for {@link Files}.
  *
- * <p>Note: {@link Files#fileTreeTraverser()} is tested in {@link FileTreeTraverserTest} and {@link
- * Files#fileTraverser()} is tested in {@link FilesFileTraverserTest}.
+ * <p>Note: {@link Files#fileTraverser()} is tested in {@link FilesFileTraverserTest}.
  *
  * @author Chris Nokleberg
  */

guava-tests/test/com/google/common/io/FileTreeTraverserTest.java

@@ -802,11 +802,10 @@ public static String getNameWithoutExtension(String file) {
    *
    * @since 15.0
    * @deprecated The returned {@link TreeTraverser} type is deprecated. Use the replacement method
-   *     {@link #fileTraverser()} instead with the same semantics as this method. This method is
-   *     scheduled to be removed in April 2018.
+   *     {@link #fileTraverser()} instead with the same semantics as this method.
    */
   @Deprecated
-  public static TreeTraverser<File> fileTreeTraverser() {
+  static TreeTraverser<File> fileTreeTraverser() {
     return FILE_TREE_TRAVERSER;
   }
 

guava-tests/test/com/google/common/io/FilesTest.java

@@ -24,7 +24,6 @@
 import com.google.common.base.Optional;
 import com.google.common.base.Predicate;
 import com.google.common.collect.ImmutableList;
-import com.google.common.collect.TreeTraverser;
 import com.google.common.graph.SuccessorsFunction;
 import com.google.common.graph.Traverser;
 import com.google.common.io.ByteSource.AsCharSource;
@@ -267,40 +266,6 @@ public static ImmutableList<Path> listFiles(Path dir) throws IOException {
     }
   }
 
-  /**
-   * Returns a {@link TreeTraverser} for traversing a directory tree. The returned traverser
-   * attempts to avoid following symbolic links to directories. However, the traverser cannot
-   * guarantee that it will not follow symbolic links to directories as it is possible for a
-   * directory to be replaced with a symbolic link between checking if the file is a directory and
-   * actually reading the contents of that directory.
-   *
-   * <p>Note that if the {@link Path} passed to one of the traversal methods does not exist, no
-   * exception will be thrown and the returned {@link Iterable} will contain a single element: that
-   * path.
-   *
-   * <p>{@link DirectoryIteratorException} may be thrown when iterating {@link Iterable} instances
-   * created by this traverser if an {@link IOException} is thrown by a call to {@link
-   * #listFiles(Path)}.
-   *
-   * @deprecated The returned {@link TreeTraverser} type is deprecated. Use the replacement method
-   *     {@link #fileTraverser()} instead with the same semantics as this method. This method is
-   *     scheduled to be removed in April 2018.
-   */
-  @Deprecated
-  public static TreeTraverser<Path> directoryTreeTraverser() {
-    return DirectoryTreeTraverser.INSTANCE;
-  }
-
-  private static final class DirectoryTreeTraverser extends TreeTraverser<Path> {
-
-    private static final DirectoryTreeTraverser INSTANCE = new DirectoryTreeTraverser();
-
-    @Override
-    public Iterable<Path> children(Path dir) {
-      return fileTreeChildren(dir);
-    }
-  }
-
   /**
    * Returns a {@link Traverser} instance for the file and directory tree. The returned traverser
    * starts from a {@link Path} and will return all files and directories it encounters.