Remove backends.

compiler/java/com/google/dart/compiler/backend/js/JavascriptBackend.java

Index: compiler/java/com/google/dart/compiler/backend/js/JavascriptBackend.java
diff --git a/compiler/java/com/google/dart/compiler/backend/js/JavascriptBackend.java b/compiler/java/com/google/dart/compiler/backend/js/JavascriptBackend.java
deleted file mode 100644
index c33143c38c5a61ca2b6d785ed998d6865e5e44d7..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/backend/js/JavascriptBackend.java
+++ /dev/null
@@ -1,181 +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.backend.js;
-
-import com.google.common.io.CharStreams;
-import com.google.common.io.Closeables;
-import com.google.dart.compiler.DartCompilerContext;
-import com.google.dart.compiler.DartSource;
-import com.google.dart.compiler.LibrarySource;
-import com.google.dart.compiler.ast.LibraryNode;
-import com.google.dart.compiler.ast.LibraryUnit;
-import com.google.dart.compiler.backend.js.analysis.TreeShaker;
-import com.google.dart.compiler.metrics.CompilerMetrics;
-import com.google.dart.compiler.resolver.CoreTypeProvider;
-
-import java.io.IOException;
-import java.io.Reader;
-import java.io.Writer;
-import java.util.Collection;
-
-/**
- * A compiler backend that produces raw Javascript.
- */
-public class JavascriptBackend extends AbstractJsBackend  {
-
-  public static final String EXTENSION_APP_JS_COMPLETE = EXTENSION_APP_JS + ".complete";
-
-  /**
-   * Wraps an Appendable and keeps track of the current offset as line/columns.
-   */
-  static class CountingAppendable implements Appendable {
-
-    private int line = 0;
-    private int column = 0;
-    private Appendable out;
-    private long charCount = 0;
-
-    CountingAppendable(Appendable out) {
-      this.out = out;
-    }
-
-    @Override
-    public Appendable append(CharSequence csq) throws IOException {
-      incCount(csq, 0, csq.length());
-      return out.append(csq);
-    }
-
-    @Override
-    public Appendable append(char c) throws IOException {
-      incCount(c);
-      return out.append(c);
-    }
-
-    @Override
-    public Appendable append(CharSequence csq, int start, int end)
-        throws IOException {
-      incCount(csq, start, end);
-      return out.append(csq, start, end);
-    }
-
-    private void incCount(CharSequence cs, int start, int end) {
-      for (int i = 0; i < cs.length(); i++) {
-        incCount(cs.charAt(i));
-      }
-    }
-
-    private void incCount(char c) {
-      ++charCount;
-      if (c == '\n') {
-        line++;
-        column = 0;
-      } else {
-        column++;
-      }
-    }
-  }
-
-  private static class DepsWritingCallback implements DepsCallback {
-    private final DartCompilerContext context;
-    private CountingAppendable out;
-    DepsWritingCallback(
-        DartCompilerContext context,
-        CountingAppendable out) {
-      this.out = out;
-      this.context = context;
-    }
-
-    @Override
-    public void visitNative(LibraryUnit libUnit, LibraryNode node)
-        throws IOException {
-      DartSource nativeSrc = libUnit.getSource().getSourceFor(node.getText());
-      Reader r = nativeSrc.getSourceReader();
-      long charsWrittenForFile = CharStreams.copy(r, out);
-    }
-
-    @Override
-    public void visitPart(Part part) throws IOException {
-      DartSource src = part.unit.getSource();
-      assert(src != null);
-      Reader r = context.getArtifactReader(src, part.part, EXTENSION_JS);
-      if (r == null) {
-        return;
-      }
-
-      long partSize = 0;
-      boolean failed = true;
-      try {
-        partSize = CharStreams.copy(r, out);
-        failed = false;
-      } finally {
-        Closeables.close(r, failed);
-      }
-    }
-
-    public long getCharsWritten() {
-      return out.charCount;
-    }
-  }
-
-  private static long packageLibs(Writer w,
-                                  DartCompilerContext context) throws IOException {
-    final CountingAppendable out = new CountingAppendable(w);
-
-    DepsWritingCallback callback = new DepsWritingCallback(context, out);
-    DependencyBuilder.build(context.getAppLibraryUnit(), callback);
-    return callback.getCharsWritten();
-  }
-
-  @Override
-  public void packageApp(LibrarySource app,
-                         Collection<LibraryUnit> libraries,
-                         DartCompilerContext context,
-                         CoreTypeProvider typeProvider)
-      throws IOException {
-
-    LibraryUnit appLibraryUnit = context.getAppLibraryUnit();
-    boolean hasEntryPoint = appLibraryUnit.getElement().getEntryPoint() != null;
-
-    String completeArtifactName = EXTENSION_APP_JS;
-    if (hasEntryPoint) {
-      // Apps with entry points will be reduced so we write into a different file name
-      completeArtifactName = EXTENSION_APP_JS_COMPLETE;
-    }
-
-    Writer out = context.getArtifactWriter(app, "", completeArtifactName);
-    long outputFileSize = 0;
-    boolean failed = true;
-    try {
-      // Emit the concatenated Javascript sources in dependency order.
-      outputFileSize = packageLibs(out, context);
-      outputFileSize += writeEntryPointCall(getMangledEntryPoint(context), out);
-      failed = false;
-    } finally {
-      Closeables.close(out, failed);
-    }
-
-
-    if (hasEntryPoint) {
-      Writer artifactWriter = context.getArtifactWriter(app, "", EXTENSION_APP_JS);
-      try {
-        failed = true;
-        outputFileSize = TreeShaker.reduce(app, context, completeArtifactName, artifactWriter);
-        failed = false;
-      } finally {
-        Closeables.close(artifactWriter, failed);
-      }
-    }
-
-    CompilerMetrics compilerMetrics = context.getCompilerMetrics();
-    if (compilerMetrics != null) {
-      compilerMetrics.packagedJsApplication(outputFileSize, -1);
-    }
-  }
-
-  @Override
-  public String getAppExtension() {
-    return EXTENSION_APP_JS;
-  }
-}