Clean up some messiness in Scopes.

src/ast.cc

Index: src/ast.cc
diff --git a/src/ast.cc b/src/ast.cc
index 9ff1be73bc023fb10e8986d7bc43af8baf42b98b..f47dffd8d734f7cf25622c5ada623efc0e12965d 100644
--- a/src/ast.cc
+++ b/src/ast.cc
@@ -70,6 +70,16 @@ CountOperation* ExpressionStatement::StatementAsCountOperation() {
 }
 
 
+VariableProxy::VariableProxy(Variable* var)
+    : name_(var->name()),
+      var_(NULL),  // Will be set by the call to BindTo.
+      is_this_(var->is_this()),
+      inside_with_(false),
+      is_trivial_(false) {
+  BindTo(var);
+}
+
+
 VariableProxy::VariableProxy(Handle<String> name,
                              bool is_this,
                              bool inside_with)