Internalize string keys in Keyed{Store,Load}IC.

src/factory.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 207 matching lines @@
   // Create a 'with' context.
   Handle<Context> NewWithContext(Handle<JSFunction> function,
                                  Handle<Context> previous,
                                  Handle<JSObject> extension);
 
   // Create a block context.
   Handle<Context> NewBlockContext(Handle<JSFunction> function,
                                   Handle<Context> previous,
                                   Handle<ScopeInfo> scope_info);
 
-  // Return the internalized version of the passed in string.
-  Handle<String> InternalizedStringFromString(Handle<String> value);
-
   // Allocate a new struct.  The struct is pretenured (allocated directly in
   // the old generation).
   Handle<Struct> NewStruct(InstanceType type);
 
   Handle<AliasedArgumentsEntry> NewAliasedArgumentsEntry(
       int aliased_context_slot);
 
   Handle<DeclaredAccessorDescriptor> NewDeclaredAccessorDescriptor();
 
   Handle<DeclaredAccessorInfo> NewDeclaredAccessorInfo();
@@ skipping 359 matching lines @@
                           isolate());
   } else {
     return NewNumber(static_cast<double>(value), pretenure);
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FACTORY_H_