Remove unused class BinaryPosition

The class was added in Iefd79fec5 34eef8323 ("Extract position in file
from Origin", 2017-12-04) but has never been used.

Change-Id: If9af9b05b080f5d6156dfc2045cb5ce886633260
diff --git a/src/main/java/com/android/tools/r8/position/BinaryPosition.java b/src/main/java/com/android/tools/r8/position/BinaryPosition.java
deleted file mode 100644
index 5eb2da2..0000000
--- a/src/main/java/com/android/tools/r8/position/BinaryPosition.java
+++ /dev/null
@@ -1,49 +0,0 @@
-// Copyright (c) 2017, the R8 project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-package com.android.tools.r8.position;
-
-public class BinaryPosition implements Position {
-
-  /**
-   * Byte offset from start of the resource.
-   */
-  private final long offset;
-
-  public BinaryPosition(long offset) {
-    assert offset >= 0;
-    this.offset = offset;
-  }
-
-  public long getOffset() {
-    return offset;
-  }
-
-  @Override
-  public String toString() {
-    return "Index : " + offset;
-  }
-
-  @Override
-  public int hashCode() {
-    return Long.hashCode(offset);
-  }
-
-  @Override
-  public boolean equals(Object o) {
-    if (o == this) {
-      return true;
-    }
-    if (o != null  && o.getClass().equals(BinaryPosition.class)) {
-      BinaryPosition other = (BinaryPosition) o;
-      return offset == other.offset;
-    }
-    return false;
-  }
-
-  @Override
-  public String getDescription() {
-    return "Offset " + offset;
-  }
-}