Revert "Add support for source maps in deferred libraries."

sdk/lib/_internal/compiler/implementation/js_emitter/old_emitter/emitter.dart

Index: sdk/lib/_internal/compiler/implementation/js_emitter/old_emitter/emitter.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_emitter/old_emitter/emitter.dart b/sdk/lib/_internal/compiler/implementation/js_emitter/old_emitter/emitter.dart
index cde4a58be3c2f8aa8e4696b22cf991104af56195..5af1cde6c8c8197dd48214b6734f128c8483cb34 100644
--- a/sdk/lib/_internal/compiler/implementation/js_emitter/old_emitter/emitter.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_emitter/old_emitter/emitter.dart
@@ -1293,7 +1293,7 @@ class OldEmitter implements Emitter {
     cspPrecompiledConstructorNamesFor(outputUnit).add(js('#', constructorName));
   }
 
-  /// Extracts the output name of the compiler's outputUri.
+  /// Returns a name composed of the main output file name and [name].
   String deferredPartFileName(OutputUnit outputUnit,
                               {bool addExtension: true}) {
     String outPath = compiler.outputUri != null
@@ -1646,14 +1646,15 @@ class OldEmitter implements Emitter {
     }
 
     String assembledCode = mainBuffer.getText();
+    String sourceMapTags = "";
     if (generateSourceMap) {
       outputSourceMap(assembledCode, mainBuffer, '',
           compiler.sourceMapUri, compiler.outputUri);
-      mainBuffer.add(
-          generateSourceMapTag(compiler.sourceMapUri, compiler.outputUri));
-      assembledCode = mainBuffer.getText();
+      sourceMapTags =
+          generateSourceMapTag(compiler.sourceMapUri, compiler.outputUri);
     }
-
+    mainBuffer.add(sourceMapTags);
+    assembledCode = mainBuffer.getText();
     compiler.outputProvider('', 'js')
         ..add(assembledCode)
         ..close();
@@ -1883,38 +1884,23 @@ class OldEmitter implements Emitter {
                 allowVariableMinification: false).getText());
       }
 
+      String code = outputBuffer.getText();
+
       // Make a unique hash of the code (before the sourcemaps are added)
       // This will be used to retrieve the initializing function from the global
       // variable.
-      String hash = hashOfString(outputBuffer.getText());
-
-      outputBuffer.add('${deferredInitializers}["$hash"]$_=$_'
-                       '${deferredInitializers}.current$N');
-
-      String partPrefix = deferredPartFileName(outputUnit, addExtension: false);
-      if (generateSourceMap) {
-        String partName = "$partPrefix.part";
-        String mapFileName = partName + ".js.map";
-        List<String> mapSegments = compiler.sourceMapUri.pathSegments.toList();
-        mapSegments[mapSegments.length - 1] = mapFileName;
-        Uri mapUri = compiler.sourceMapUri.replace(pathSegments: mapSegments);
-
-        String partFileName = partName + ".js";
-        List<String> partSegments = compiler.outputUri.pathSegments.toList();
-        partSegments[mapSegments.length - 1] = partFileName;
-        Uri partUri = compiler.outputUri.replace(pathSegments: partSegments);
-
-        outputSourceMap(outputBuffer.getText(), outputBuffer, partName,
-            mapUri, partUri);
-        outputBuffer.add(generateSourceMapTag(mapUri, partUri));
-      }
+      String hash = hashOfString(code);
 
       outputBuffers[outputUnit] = outputBuffer;
-      compiler.outputProvider(partPrefix, 'part.js')
-        ..add(outputBuffer.getText())
+      compiler.outputProvider(
+          deferredPartFileName(outputUnit, addExtension: false), 'part.js')
+        ..add(code)
+        ..add('${deferredInitializers}["$hash"]$_=$_'
+                '${deferredInitializers}.current$N')
         ..close();
 
       hunkHashes[outputUnit] = hash;
+      // TODO(johnniwinther): Support source maps for deferred code.
     }
     return hunkHashes;
   }