Remove dartc optimizing backend.

dart/compiler/java/com/google/dart/compiler/common/SourceMapping.java

Index: dart/compiler/java/com/google/dart/compiler/common/SourceMapping.java
diff --git a/dart/compiler/java/com/google/dart/compiler/common/SourceMapping.java b/dart/compiler/java/com/google/dart/compiler/common/SourceMapping.java
deleted file mode 100644
index 6aee6d77eccdc77d1a1e0b47141613b91ad16838..0000000000000000000000000000000000000000
--- a/dart/compiler/java/com/google/dart/compiler/common/SourceMapping.java
+++ /dev/null
@@ -1,52 +0,0 @@
-// Copyright (c) 2011, the Dart 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.google.dart.compiler.common;
-
-import com.google.debugging.sourcemap.FilePosition;
-
-
-/**
- * Maintains a mapping from a given node to the position
- * in the source code at which its generated form was
- * placed. This position is relative only to the current
- * run.
- *
- * @see GenerateSourceMap
- */
-public class SourceMapping {
-  final HasSourceInfo node;
-  final FilePosition start;
-  FilePosition end;
-
-  public SourceMapping(HasSourceInfo node, FilePosition start) {
-    this.node = node;
-    this.start = start;
-  }
-
-  /**
-   * @return the end
-   */
-  public FilePosition getEnd() {
-    return end;
-  }
-  /**
-   * @param end the end to set
-   */
-  public void setEnd(FilePosition end) {
-    this.end = end;
-  }
-  /**
-   * @return the node
-   */
-  public HasSourceInfo getNode() {
-    return node;
-  }
-  /**
-   * @return the start
-   */
-  public FilePosition getStart() {
-    return start;
-  }
-}