Remove some dead code.

src/isolate.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 752 matching lines @@
   void TraceException(bool flag);
 
   // Out of resource exception helpers.
   Failure* StackOverflow();
   Failure* TerminateExecution();
 
   // Administration
   void Iterate(ObjectVisitor* v);
   void Iterate(ObjectVisitor* v, ThreadLocalTop* t);
   char* Iterate(ObjectVisitor* v, char* t);
-  void IterateThread(ThreadVisitor* v);
   void IterateThread(ThreadVisitor* v, char* t);
 
 
   // Returns the current native and global context.
   Handle<Context> native_context();
   Handle<Context> global_context();
 
   // Returns the native context of the calling JavaScript code.  That
   // is, the native context of the top-most JavaScript frame.
   Handle<Context> GetCallingNativeContext();
@@ skipping 132 matching lines @@
   }
 
   RuntimeState* runtime_state() { return &runtime_state_; }
 
   void set_fp_stubs_generated(bool value) {
     fp_stubs_generated_ = value;
   }
 
   bool fp_stubs_generated() { return fp_stubs_generated_; }
 
-  StaticResource<SafeStringInputBuffer>* compiler_safe_string_input_buffer() {
-    return &compiler_safe_string_input_buffer_;
-  }
-
   Builtins* builtins() { return &builtins_; }
 
   void NotifyExtensionInstalled() {
     has_installed_extensions_ = true;
   }
 
   bool has_installed_extensions() { return has_installed_extensions_; }
 
   unibrow::Mapping<unibrow::Ecma262Canonicalize>*
       regexp_macro_assembler_canonicalize() {
@@ skipping 286 matching lines @@
   PreallocatedStorage in_use_list_;
   PreallocatedStorage free_list_;
   bool preallocated_storage_preallocated_;
   InnerPointerToCodeCache* inner_pointer_to_code_cache_;
   StringInputBuffer* write_input_buffer_;
   GlobalHandles* global_handles_;
   ContextSwitcher* context_switcher_;
   ThreadManager* thread_manager_;
   RuntimeState runtime_state_;
   bool fp_stubs_generated_;
-  StaticResource<SafeStringInputBuffer> compiler_safe_string_input_buffer_;
   Builtins builtins_;
   bool has_installed_extensions_;
   StringTracker* string_tracker_;
   unibrow::Mapping<unibrow::Ecma262UnCanonicalize> jsregexp_uncanonicalize_;
   unibrow::Mapping<unibrow::CanonicalizationRange> jsregexp_canonrange_;
   StringInputBuffer objects_string_compare_buffer_a_;
   StringInputBuffer objects_string_compare_buffer_b_;
   StaticResource<StringInputBuffer> objects_string_input_buffer_;
   unibrow::Mapping<unibrow::Ecma262Canonicalize>
       regexp_macro_assembler_canonicalize_;
@@ skipping 198 matching lines @@
 
 // Mark the native context with out of memory.
 inline void Context::mark_out_of_memory() {
   native_context()->set_out_of_memory(HEAP->true_value());
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_