Access BackendUsage through ClosedWorld

pkg/compiler/lib/src/resolution/resolution_strategy.dart

Index: pkg/compiler/lib/src/resolution/resolution_strategy.dart
diff --git a/pkg/compiler/lib/src/resolution/resolution_strategy.dart b/pkg/compiler/lib/src/resolution/resolution_strategy.dart
index a7125c7e123e463237c5a3ceec7a57e5e81c1296..29c02e91ddffdc154ac5fa5388fc19380987311d 100644
--- a/pkg/compiler/lib/src/resolution/resolution_strategy.dart
+++ b/pkg/compiler/lib/src/resolution/resolution_strategy.dart
@@ -119,6 +119,7 @@ class ResolutionFrontEndStrategy implements FrontEndStrategy {
       NativeBasicData nativeBasicData,
       NativeDataBuilder nativeDataBuilder,
       InterceptorDataBuilder interceptorDataBuilder,
+      BackendUsageBuilder backendUsageBuilder,
       SelectorConstraintsStrategy selectorConstraintsStrategy) {
     return new ElementResolutionWorldBuilder(
         _compiler.backend,
@@ -126,6 +127,7 @@ class ResolutionFrontEndStrategy implements FrontEndStrategy {
         nativeBasicData,
         nativeDataBuilder,
         interceptorDataBuilder,
+        backendUsageBuilder,
         selectorConstraintsStrategy);
   }