Kill dead code

runtime/vm/debugger.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/debugger.h"
 
 #include "include/dart_api.h"
 
 #include "platform/address_sanitizer.h"
 
@@ skipping 937 matching lines @@
         ctx_ ^= Closure::Cast(obj).context();
       } else if (obj.IsContext()) {
         ctx_ ^= Context::Cast(obj).raw();
       } else {
         ASSERT(obj.IsNull());
       }
       return ctx_;
     }
   }
   return ctx_;
-  return Context::ZoneHandle(Context::null());
 }
 
 
 RawObject* ActivationFrame::GetAsyncOperation() {
   GetVarDescriptors();
   intptr_t var_desc_len = var_descriptors_.Length();
   for (intptr_t i = 0; i < var_desc_len; i++) {
     RawLocalVarDescriptors::VarInfo var_info;
     var_descriptors_.GetInfo(i, &var_info);
     if (var_descriptors_.GetName(i) == Symbols::AsyncOperation().raw()) {
@@ skipping 3399 matching lines @@
 
 void Debugger::RegisterCodeBreakpoint(CodeBreakpoint* bpt) {
   ASSERT(bpt->next() == NULL);
   bpt->set_next(code_breakpoints_);
   code_breakpoints_ = bpt;
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart