Revert of Add script context with context-allocated "const this"

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index ecf05f4bc53555367cf1c19c649c6be9d2d0b0d3..810a8b92210d4bb2389d024490c65b0b88e22eb1 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -10197,11 +10197,12 @@
     if (var->IsUnallocated()) {
       Bailout(kDeleteWithGlobalVariable);
     } else if (var->IsStackAllocated() || var->IsContextSlot()) {
-      // Result of deleting non-global variables is false.  'this' is not really
-      // a variable, though we implement it as one.  The subexpression does not
-      // have side effects.
-      HValue* value = var->HasThisName(isolate()) ? graph()->GetConstantTrue()
-                                                  : graph()->GetConstantFalse();
+      // Result of deleting non-global variables is false.  'this' is not
+      // really a variable, though we implement it as one.  The
+      // subexpression does not have side effects.
+      HValue* value = var->is_this()
+          ? graph()->GetConstantTrue()
+          : graph()->GetConstantFalse();
       return ast_context()->ReturnValue(value);
     } else {
       Bailout(kDeleteWithNonGlobalVariable);