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

src/factory.h

Index: src/factory.h
diff --git a/src/factory.h b/src/factory.h
index 284e6f96a5fcf1c2baa78aa7128be53a89e356b9..00ae587d640aadcaac3e9cb5cf8be0b93dfef162 100644
--- a/src/factory.h
+++ b/src/factory.h
@@ -225,9 +225,6 @@ class Factory {
                                   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);