Address some leftover review comments from previous CL.

vm/object.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/object.h"
 
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
 #include "vm/bootstrap.h"
@@ skipping 7812 matching lines @@
   return "Integer";
 }
 
 
 RawInteger* Integer::New(const String& str, Heap::Space space) {
   // We are not supposed to have integers represented as two byte or
   // four byte strings.
   ASSERT(str.IsOneByteString());
   const OneByteString& onestr = OneByteString::Cast(str);
   int64_t value;
-  if (!OS::StringToInteger(onestr.ToCString(), &value)) {
+  if (!OS::StringToInt64(onestr.ToCString(), &value)) {
     const Bigint& big = Bigint::Handle(Bigint::New(onestr, space));
     ASSERT(!BigintOperations::FitsIntoSmi(big));
     ASSERT(!BigintOperations::FitsIntoMint(big));
     return big.raw();
   }
   return Integer::New(value, space);
 }
 
 
 RawInteger* Integer::New(int64_t value, Heap::Space space) {
@@ skipping 2956 matching lines @@
   const String& str = String::Handle(pattern());
   const char* format = "JSRegExp: pattern=%s flags=%s";
   intptr_t len = OS::SNPrint(NULL, 0, format, str.ToCString(), Flags());
   char* chars = reinterpret_cast<char*>(
       Isolate::Current()->current_zone()->Allocate(len + 1));
   OS::SNPrint(chars, (len + 1), format, str.ToCString(), Flags());
   return chars;
 }
 
 }  // namespace dart