Remove unused variable.

runtime/vm/bootstrap_natives.cc

 // Copyright (c) 2011, 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/bootstrap.h"
 
 #include "include/dart_api.h"
 
 #include "vm/bootstrap_natives.h"
 #include "vm/dart_api_impl.h"
@@ skipping 33 matching lines @@
         // TODO(regis): Should we pass a buffer for error reporting?
         return NULL;
       }
     }
   }
   return NULL;
 }
 
 
 void Bootstrap::SetupNativeResolver() {
-  Isolate* isolate = Isolate::Current();
   Library& library = Library::Handle();
 
   library = Library::CoreLibrary();
   ASSERT(!library.IsNull());
   library.set_native_entry_resolver(
       reinterpret_cast<Dart_NativeEntryResolver>(NativeLookup));
 
   library = Library::CoreImplLibrary();
   ASSERT(!library.IsNull());
   library.set_native_entry_resolver(
       reinterpret_cast<Dart_NativeEntryResolver>(NativeLookup));
 
   library = Library::MirrorsLibrary();
   ASSERT(!library.IsNull());
   library.set_native_entry_resolver(
       reinterpret_cast<Dart_NativeEntryResolver>(NativeLookup));
 
   library = Library::IsolateLibrary();
   ASSERT(!library.IsNull());
   library.set_native_entry_resolver(
       reinterpret_cast<Dart_NativeEntryResolver>(NativeLookup));
 }
 
 }  // namespace dart