Direct call to eval passes strict mode through.

src/full-codegen.h

Index: src/full-codegen.h
diff --git a/src/full-codegen.h b/src/full-codegen.h
index 0482ee8d947b30a112d18a5453082b2d891c1487..6167724dcc28a646cfaf43b0cef2ad1e085f14d0 100644
--- a/src/full-codegen.h
+++ b/src/full-codegen.h
@@ -531,6 +531,7 @@ class FullCodeGenerator: public AstVisitor {
 
   Handle<Script> script() { return info_->script(); }
   bool is_eval() { return info_->is_eval(); }
+  bool is_strict() { return function()->strict_mode(); }
   FunctionLiteral* function() { return info_->function(); }
   Scope* scope() { return info_->scope(); }