Small cleanups in the Kernel FlowGraphBuilder

runtime/vm/kernel.cc

Index: runtime/vm/kernel.cc
diff --git a/runtime/vm/kernel.cc b/runtime/vm/kernel.cc
index f30e10060c9672ad61cac82c1c64d48dff914391..48dcbdeeb7b13cbe35a67e1a0ae8b3ec0d6494ec 100644
--- a/runtime/vm/kernel.cc
+++ b/runtime/vm/kernel.cc
@@ -752,20 +752,6 @@ void Let::VisitChildren(Visitor* visitor) {
 }
 
 
-BlockExpression::~BlockExpression() {}
-
-
-void BlockExpression::AcceptExpressionVisitor(ExpressionVisitor* visitor) {
-  visitor->VisitBlockExpression(this);
-}
-
-
-void BlockExpression::VisitChildren(Visitor* visitor) {
-  visitor->VisitBlock(body());
-  value()->AcceptExpressionVisitor(visitor);
-}
-
-
 Statement::~Statement() {}