Remove dartc optimizing backend.

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

Index: dart/compiler/java/com/google/dart/compiler/backend/js/JavascriptBackend.java
diff --git a/dart/compiler/java/com/google/dart/compiler/backend/js/JavascriptBackend.java b/dart/compiler/java/com/google/dart/compiler/backend/js/JavascriptBackend.java
index badebcef8641525af7e5aa18f9aa1b31cda1f562..4cc2a1db926c6b551225d42a25bf94ca12d8d3a7 100644
--- a/dart/compiler/java/com/google/dart/compiler/backend/js/JavascriptBackend.java
+++ b/dart/compiler/java/com/google/dart/compiler/backend/js/JavascriptBackend.java
@@ -13,11 +13,8 @@ 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.common.GenerateSourceMap;
 import com.google.dart.compiler.metrics.CompilerMetrics;
 import com.google.dart.compiler.resolver.CoreTypeProvider;
-import com.google.debugging.sourcemap.FilePosition;
-import com.google.debugging.sourcemap.SourceMapSection;
 
 import java.io.IOException;
 import java.io.Reader;
@@ -41,10 +38,6 @@ public class JavascriptBackend extends AbstractJsBackend  {
     private int column = 0;
     private Appendable out;
     private long charCount = 0;
-    
-    FilePosition getOffset() {
-      return new FilePosition(line, column);
-    }
 
     CountingAppendable(Appendable out) {
       this.out = out;
@@ -89,14 +82,11 @@ public class JavascriptBackend extends AbstractJsBackend  {
   private static class DepsWritingCallback implements DepsCallback {
     private final DartCompilerContext context;
     private CountingAppendable out;
-    private final List<SourceMapSection> appSections;
     DepsWritingCallback(
         DartCompilerContext context,
-        CountingAppendable out,
-        List<SourceMapSection> appSections) {
+        CountingAppendable out) {
       this.out = out;
       this.context = context;
-      this.appSections = appSections;
     }
 
     @Override
@@ -115,8 +105,6 @@ public class JavascriptBackend extends AbstractJsBackend  {
       if (r == null) {
         return;
       }
-      FilePosition offset = out.getOffset();
-      assert(src != null);
 
       long partSize = 0;
       boolean failed = true;
@@ -126,13 +114,6 @@ public class JavascriptBackend extends AbstractJsBackend  {
       } finally {
         Closeables.close(r, failed);
       }
-
-      if (partSize > 0) {
-        String mapUrl = context.getArtifactUri(src, part.part, EXTENSION_JS_SRC_MAP).toString();
-        SourceMapSection sourceMapSection =
-            SourceMapSection.forURL(mapUrl, offset.getLine(), offset.getColumn());
-        appSections.add(sourceMapSection);
-      }
     }
 
     public long getCharsWritten() {
@@ -141,11 +122,10 @@ public class JavascriptBackend extends AbstractJsBackend  {
   }
 
   private static long packageLibs(Writer w,
-                                  List<SourceMapSection> appSections,
                                   DartCompilerContext context) throws IOException {
     final CountingAppendable out = new CountingAppendable(w);
 
-    DepsWritingCallback callback = new DepsWritingCallback(context, out, appSections);
+    DepsWritingCallback callback = new DepsWritingCallback(context, out);
     DependencyBuilder.build(context.getAppLibraryUnit(), callback);
     return callback.getCharsWritten();
   }
@@ -160,7 +140,6 @@ public class JavascriptBackend extends AbstractJsBackend  {
     LibraryUnit appLibraryUnit = context.getAppLibraryUnit();
     boolean hasEntryPoint = appLibraryUnit.getElement().getEntryPoint() != null;
     
-    List<SourceMapSection> appSections = Lists.newArrayList();
     String completeArtifactName = EXTENSION_APP_JS;
     if (hasEntryPoint) {
       // Apps with entry points will be reduced so we write into a different file name
@@ -172,7 +151,7 @@ public class JavascriptBackend extends AbstractJsBackend  {
     boolean failed = true;
     try {
       // Emit the concatenated Javascript sources in dependency order.
-      outputFileSize = packageLibs(out, appSections, context);
+      outputFileSize = packageLibs(out, context);
       outputFileSize += writeEntryPointCall(getMangledEntryPoint(context), out);
       failed = false;
     } finally {
@@ -195,32 +174,10 @@ public class JavascriptBackend extends AbstractJsBackend  {
     if (compilerMetrics != null) {
       compilerMetrics.packagedJsApplication(outputFileSize, -1);
     }
-
-    Writer srcMapOut = context.getArtifactWriter(app, "", EXTENSION_APP_JS_SRC_MAP);
-    failed = true;
-    try {
-      // TODO(johnlenz): settle how we want to get a reference to the app
-      // output.  Do we want this to be a filename, a URL, both?
-      new GenerateSourceMap().appendIndexMapTo(srcMapOut, app.getName() + "."
-          + EXTENSION_JS, appSections);
-      failed = false;
-    } finally {
-      Closeables.close(srcMapOut, failed);
-    }
   }
 
   @Override
   public String getAppExtension() {
     return EXTENSION_APP_JS;
   }
-
-  @Override
-  public String getSourceMapExtension() {
-    return EXTENSION_APP_JS_SRC_MAP;
-  }
-
-  @Override
-  protected boolean shouldOptimize() {
-    return false;
-  }
 }