Hide the URIs in minified mode.

sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart

 // Copyright (c) 2012, 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.
 
 part of dart2js.js_emitter;
 
 /**
  * Generates the code for all used classes in the program. Static fields (even
  * in classes) are ignored, since they can be treated as non-class elements.
  *
@@ skipping 1281 matching lines @@
         new MyClass();
         #;
         return properties;
       }''', [debugCode]);
 
     mainBuffer.add(jsAst.prettyPrint(convertToFastObject, compiler));
     mainBuffer.add(N);
   }
 
   void writeLibraryDescriptors(LibraryElement library) {
-    var uri = library.canonicalUri;
-    if (uri.scheme == 'file' && compiler.outputUri != null) {
-      uri = relativize(compiler.outputUri, library.canonicalUri, false);
+    var uri = "";
+    if (!compiler.enableMinification || backend.mustRetainUris) {
+      uri = library.canonicalUri;
+      if (uri.scheme == 'file' && compiler.outputUri != null) {
+        uri = relativize(compiler.outputUri, library.canonicalUri, false);
+      }
     }
+    String libraryName =
+        (!compiler.enableMinification || backend.mustRetainLibraryNames) ?
+        library.getLibraryName() :
+        "";
     Map<OutputUnit, ClassBuilder> descriptors =
         elementDescriptors[library];
 
     for (OutputUnit outputUnit in compiler.deferredLoadTask.allOutputUnits) {
       ClassBuilder descriptor =
           descriptors.putIfAbsent(outputUnit, () => new ClassBuilder(namer));
       if (descriptor.properties.isEmpty) continue;
       bool isDeferred =
           outputUnit != compiler.deferredLoadTask.mainOutputUnit;
       jsAst.Fun metadata = metadataEmitter.buildMetadataFunction(library);
 
       jsAst.ObjectInitializer initializers =
           descriptor.toObjectInitializer();
       CodeBuffer outputBuffer =
           outputBuffers.putIfAbsent(outputUnit, () => new CodeBuffer());
       int sizeBefore = outputBuffer.length;
       outputBuffers[outputUnit]
-          ..write('["${library.getLibraryName()}",$_')
+          ..write('["$libraryName",$_')
           ..write('"${uri}",$_')
           ..write(metadata == null ? "" : jsAst.prettyPrint(metadata, compiler))
           ..write(',$_')
           ..write(namer.globalObjectFor(library))
           ..write(',$_')
           ..write(jsAst.prettyPrint(initializers, compiler))
           ..write(library == compiler.mainApp ? ',${n}1' : "")
           ..write('],$n');
       int sizeAfter = outputBuffer.length;
       compiler.dumpInfoTask.codeSizeCounter
@@ skipping 463 matching lines @@
     for (Element element in compiler.enqueuer.codegen.newlyEnqueuedElements) {
       if (element.isInstanceMember) {
         cachedClassBuilders.remove(element.enclosingClass);
 
         nativeEmitter.cachedBuilders.remove(element.enclosingClass);
 
       }
     }
   }
 }