| Index: sdk/lib/_internal/compiler/implementation/js_backend/backend.dart | 
| diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart b/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart | 
| index 09dcfefb4989809d6673e8a2a371e84e6a98bef6..8464c155ed0d9dbb3444a1afce2d2513952d1fa0 100644 | 
| --- a/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart | 
| +++ b/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart | 
| @@ -1556,7 +1556,7 @@ class JavaScriptBackend extends Backend { | 
| } else if (element == preserveMetadataMarker) { | 
| mustRetainMetadata = true; | 
| } else if (element == preserveUrisMarker) { | 
| -      mustRetainUris = true; | 
| +      if (!compiler.hideUris) mustRetainUris = true; | 
| } else if (element == preserveLibraryNamesMarker) { | 
| mustRetainLibraryNames = true; | 
| } else if (element == getIsolateAffinityTagMarker) { | 
|  |