Issue 28580. Relax instantiate to bounds.

pkg/analyzer/lib/src/summary/resynthesize.dart

Index: pkg/analyzer/lib/src/summary/resynthesize.dart
diff --git a/pkg/analyzer/lib/src/summary/resynthesize.dart b/pkg/analyzer/lib/src/summary/resynthesize.dart
index bd764d409841bab943ea72506f3eabaa8bd4def5..73f09c312803cbd43f08686ab6321eb1fb9dedc8 100644
--- a/pkg/analyzer/lib/src/summary/resynthesize.dart
+++ b/pkg/analyzer/lib/src/summary/resynthesize.dart
@@ -1294,8 +1294,7 @@ class _ReferenceInfo {
       InterfaceTypeImpl type =
           new InterfaceTypeImpl.elementWithNameAndArgs(element, name, () {
         if (typeArguments == null) {
-          if (libraryResynthesizer.summaryResynthesizer.strongMode &&
-              instantiateToBoundsAllowed) {
+          if (libraryResynthesizer.summaryResynthesizer.strongMode) {
             InterfaceType instantiatedToBounds = libraryResynthesizer
                 .summaryResynthesizer.context.typeSystem
                 .instantiateToBounds(element.type) as InterfaceType;
@@ -1320,8 +1319,7 @@ class _ReferenceInfo {
         if (numTypeArguments == numTypeParameters) {
           typeArguments =
               _buildTypeArguments(numTypeArguments, getTypeArgument);
-        } else if (libraryResynthesizer.summaryResynthesizer.strongMode &&
-            instantiateToBoundsAllowed) {
+        } else if (libraryResynthesizer.summaryResynthesizer.strongMode) {
           FunctionType instantiatedToBounds = libraryResynthesizer
               .summaryResynthesizer.context.typeSystem
               .instantiateToBounds(element.type) as FunctionType;