Fix for bug http://code.google.com/p/v8/issues/detail?id=1176.

src/ia32/full-codegen-ia32.cc

Index: src/ia32/full-codegen-ia32.cc
diff --git a/src/ia32/full-codegen-ia32.cc b/src/ia32/full-codegen-ia32.cc
index d32e9aa87732c40716de28fbb8ec0e154ac614bc..998f5ac1dbc068ca52660a143fb2f1f2d97e0533 100644
--- a/src/ia32/full-codegen-ia32.cc
+++ b/src/ia32/full-codegen-ia32.cc
@@ -3743,8 +3743,8 @@ void FullCodeGenerator::VisitUnaryOperation(UnaryOperation* expr) {
         }
       } else if (var != NULL) {
         // Delete of an unqualified identifier is disallowed in strict mode
-        // so this code can only be reached in non-strict mode.
-        ASSERT(strict_mode_flag() == kNonStrictMode);
+        // (but "delete this" is).
+        ASSERT(strict_mode_flag() == kNonStrictMode || var->is_this());
         if (var->is_global()) {
           __ push(GlobalObjectOperand());
           __ push(Immediate(var->name()));