Revert "dart2js: add --preserve-uris flag."

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

Index: sdk/lib/_internal/compiler/implementation/compiler.dart
diff --git a/sdk/lib/_internal/compiler/implementation/compiler.dart b/sdk/lib/_internal/compiler/implementation/compiler.dart
index 589baba80f7ce1d98cdd8c26a2dead9fbda5d8d1..41fd4a50590f819a632e3596a2ad9ea54e8e22e3 100644
--- a/sdk/lib/_internal/compiler/implementation/compiler.dart
+++ b/sdk/lib/_internal/compiler/implementation/compiler.dart
@@ -645,10 +645,6 @@ abstract class Compiler implements DiagnosticListener {
       new ResolutionRegistry.internal(null, new TreeElementMapping(null));
 
   final bool enableMinification;
-
-  /// When `true` emits URIs in the reflection metadata.
-  final bool preserveUris;
-
   final bool enableTypeAssertions;
   final bool enableUserAssertions;
   final bool trustTypeAnnotations;
@@ -938,7 +934,6 @@ abstract class Compiler implements DiagnosticListener {
             bool disableTypeInferenceFlag: false,
             this.maxConcreteTypeSize: 5,
             this.enableMinification: false,
-            this.preserveUris: false,
             this.enableNativeLiveTypeAnalysis: false,
             bool emitJavaScript: true,
             bool dart2dartMultiFile: false,