Drop unnecessary toString() in interpolations.

pkg/analyzer/lib/src/generated/ast.dart

Index: pkg/analyzer/lib/src/generated/ast.dart
diff --git a/pkg/analyzer/lib/src/generated/ast.dart b/pkg/analyzer/lib/src/generated/ast.dart
index fff8270a0510224f0ca7e3c0c128cec8c9c3f951..bb44db5d5b3ccdd49d072ada95d431440bd68955 100644
--- a/pkg/analyzer/lib/src/generated/ast.dart
+++ b/pkg/analyzer/lib/src/generated/ast.dart
@@ -15911,7 +15911,7 @@ class SimpleIdentifier extends Identifier {
    */
   Element _returnOrReportElement(AstNode parent, bool isValid, Element element) {
     if (!isValid) {
-      AnalysisEngine.instance.logger.logInformation2("Internal error: attempting to set the name of a ${parent.runtimeType.toString()} to a ${element.runtimeType.toString()}", new JavaException());
+      AnalysisEngine.instance.logger.logInformation2("Internal error: attempting to set the name of a ${parent.runtimeType} to a ${element.runtimeType}", new JavaException());
       return null;
     }
     return element;