Remove dead strings from heap.h

src/heap.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 181 matching lines @@
   V(Symbol, observed_symbol, ObservedSymbol)
 
 #define ROOT_LIST(V)                                  \
   STRONG_ROOT_LIST(V)                                 \
   V(StringTable, string_table, StringTable)
 
 #define INTERNALIZED_STRING_LIST(V)                                      \
   V(Array_string, "Array")                                               \
   V(Object_string, "Object")                                             \
   V(proto_string, "__proto__")                                           \
-  V(StringImpl_string, "StringImpl")                                     \
   V(arguments_string, "arguments")                                       \
   V(Arguments_string, "Arguments")                                       \
   V(call_string, "call")                                                 \
   V(apply_string, "apply")                                               \
   V(caller_string, "caller")                                             \
   V(boolean_string, "boolean")                                           \
   V(Boolean_string, "Boolean")                                           \
   V(callee_string, "callee")                                             \
   V(constructor_string, "constructor")                                   \
-  V(code_string, ".code")                                                \
   V(result_string, ".result")                                            \
   V(dot_for_string, ".for.")                                             \
-  V(catch_var_string, ".catch-var")                                      \
+  V(eval_string, "eval")                                                 \
   V(empty_string, "")                                                    \
-  V(eval_string, "eval")                                                 \
   V(function_string, "function")                                         \
   V(length_string, "length")                                             \
   V(module_string, "module")                                             \
   V(name_string, "name")                                                 \
   V(native_string, "native")                                             \
   V(null_string, "null")                                                 \
   V(number_string, "number")                                             \
   V(Number_string, "Number")                                             \
   V(nan_string, "NaN")                                                   \
   V(RegExp_string, "RegExp")                                             \
   V(source_string, "source")                                             \
   V(global_string, "global")                                             \
   V(ignore_case_string, "ignoreCase")                                    \
   V(multiline_string, "multiline")                                       \
   V(input_string, "input")                                               \
   V(index_string, "index")                                               \
   V(last_index_string, "lastIndex")                                      \
   V(object_string, "object")                                             \
-  V(payload_string, "payload")                                           \
   V(literals_string, "literals")                                         \
   V(prototype_string, "prototype")                                       \
   V(string_string, "string")                                             \
   V(String_string, "String")                                             \
-  V(unknown_field_string, "unknownField")                                \
   V(symbol_string, "symbol")                                             \
   V(Symbol_string, "Symbol")                                             \
   V(Date_string, "Date")                                                 \
   V(this_string, "this")                                                 \
   V(to_string_string, "toString")                                        \
   V(char_at_string, "CharAt")                                            \
   V(undefined_string, "undefined")                                       \
   V(value_of_string, "valueOf")                                          \
   V(stack_string, "stack")                                               \
   V(toJSON_string, "toJSON")                                             \
   V(InitializeVarGlobal_string, "InitializeVarGlobal")                   \
   V(InitializeConstGlobal_string, "InitializeConstGlobal")               \
   V(KeyedLoadElementMonomorphic_string,                                  \
     "KeyedLoadElementMonomorphic")                                       \
   V(KeyedStoreElementMonomorphic_string,                                 \
     "KeyedStoreElementMonomorphic")                                      \
   V(stack_overflow_string, "kStackOverflowBoilerplate")                  \
   V(illegal_access_string, "illegal access")                             \
-  V(out_of_memory_string, "out-of-memory")                               \
   V(illegal_execution_state_string, "illegal execution state")           \
   V(get_string, "get")                                                   \
   V(set_string, "set")                                                   \
   V(map_field_string, "%map")                                            \
   V(elements_field_string, "%elements")                                  \
   V(length_field_string, "%length")                                      \
   V(cell_value_string, "%cell_value")                                    \
   V(function_class_string, "Function")                                   \
-  V(properties_field_symbol, "%properties")                              \
-  V(payload_field_symbol, "%payload")                                    \
   V(illegal_argument_string, "illegal argument")                         \
   V(MakeReferenceError_string, "MakeReferenceError")                     \
   V(MakeSyntaxError_string, "MakeSyntaxError")                           \
   V(MakeTypeError_string, "MakeTypeError")                               \
   V(invalid_lhs_in_assignment_string, "invalid_lhs_in_assignment")       \
   V(invalid_lhs_in_for_in_string, "invalid_lhs_in_for_in")               \
   V(invalid_lhs_in_postfix_op_string, "invalid_lhs_in_postfix_op")       \
   V(invalid_lhs_in_prefix_op_string, "invalid_lhs_in_prefix_op")         \
   V(illegal_return_string, "illegal_return")                             \
   V(illegal_break_string, "illegal_break")                               \
   V(illegal_continue_string, "illegal_continue")                         \
   V(unknown_label_string, "unknown_label")                               \
   V(redeclaration_string, "redeclaration")                               \
-  V(failure_string, "<failure>")                                         \
   V(space_string, " ")                                                   \
   V(exec_string, "exec")                                                 \
   V(zero_string, "0")                                                    \
   V(global_eval_string, "GlobalEval")                                    \
   V(identity_hash_string, "v8::IdentityHash")                            \
   V(closure_string, "(closure)")                                         \
   V(use_strict_string, "use strict")                                     \
   V(dot_string, ".")                                                     \
   V(anonymous_function_string, "(anonymous function)")                   \
   V(compare_ic_string, "==")                                             \
@@ skipping 2754 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_