Make Error.prototype.toString spec compliant; and fix various side-effect-free error printing metho…

src/isolate.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include <queue>
 #include <set>
 
@@ skipping 929 matching lines @@
     return date_cache_;
   }
 
   void set_date_cache(DateCache* date_cache) {
     if (date_cache != date_cache_) {
       delete date_cache_;
     }
     date_cache_ = date_cache;
   }
 
-  ErrorToStringHelper* error_tostring_helper() {
-    return &error_tostring_helper_;
-  }
-
   Map* get_initial_js_array_map(ElementsKind kind,
                                 Strength strength = Strength::WEAK);
 
   static const int kArrayProtectorValid = 1;
   static const int kArrayProtectorInvalid = 0;
 
   bool IsFastArrayConstructorPrototypeChainIntact();
 
   // On intent to set an element in object, make sure that appropriate
   // notifications occur if the set is on the elements of the array or
@@ skipping 278 matching lines @@
   ThreadManager* thread_manager_;
   RuntimeState runtime_state_;
   Builtins builtins_;
   bool has_installed_extensions_;
   unibrow::Mapping<unibrow::Ecma262UnCanonicalize> jsregexp_uncanonicalize_;
   unibrow::Mapping<unibrow::CanonicalizationRange> jsregexp_canonrange_;
   unibrow::Mapping<unibrow::Ecma262Canonicalize>
       regexp_macro_assembler_canonicalize_;
   RegExpStack* regexp_stack_;
   DateCache* date_cache_;
-  ErrorToStringHelper error_tostring_helper_;
   unibrow::Mapping<unibrow::Ecma262Canonicalize> interp_canonicalize_mapping_;
   CallInterfaceDescriptorData* call_descriptor_data_;
   base::RandomNumberGenerator* random_number_generator_;
 
   // Whether the isolate has been created for snapshotting.
   bool serializer_enabled_;
 
   // True if fatal error has been signaled for this isolate.
   bool has_fatal_error_;
 
@@ skipping 297 matching lines @@
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ISOLATE_H_