remove unnecessary class

GitOrigin-RevId: 709aa1b31e1446d5848461083310c99237e8e1af

platform/core-impl/src/com/intellij/psi/impl/source/IdentityCharTable.java

@@ -1,25 +0,0 @@
-// Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
-
-package com.intellij.psi.impl.source;
-
-import com.intellij.util.CharTable;
-import org.jetbrains.annotations.NotNull;
-
-public final class IdentityCharTable implements CharTable {
-  private IdentityCharTable() { }
-
-  public static final IdentityCharTable INSTANCE = new IdentityCharTable();
-
-  @NotNull
-  @Override
-  public CharSequence intern(@NotNull final CharSequence text) {
-    return text;
-  }
-
-  @NotNull
-  @Override
-  public CharSequence intern(@NotNull CharSequence baseText, int startOffset, int endOffset) {
-    if (startOffset == 0  && endOffset == baseText.length()) return baseText;
-    return baseText.subSequence(startOffset, endOffset);
-  }
-}