Enforce WARN_UNUSED_RESULT attribute on Windows

sandbox/win/src/target_process.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sandbox/win/src/target_process.h"
 
 #include "base/basictypes.h"
+#include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/win/pe_image.h"
 #include "base/win/startup_information.h"
 #include "base/win/windows_version.h"
 #include "sandbox/win/src/crosscall_server.h"
 #include "sandbox/win/src/crosscall_client.h"
 #include "sandbox/win/src/policy_low_level.h"
 #include "sandbox/win/src/sandbox_types.h"
 #include "sandbox/win/src/sharedmem_ipc_server.h"
 #include "sandbox/win/src/win_utils.h"
@@ skipping 74 matching lines @@
     ::WaitForSingleObject(sandbox_process_info_.process_handle(), 50);
     // At this point, the target process should have been killed.  Check.
     if (!::GetExitCodeProcess(sandbox_process_info_.process_handle(),
                               &exit_code) || (STILL_ACTIVE == exit_code)) {
       // Something went wrong.  We don't know if the target is in a state where
       // it can manage to do another IPC call.  If it can, and we've destroyed
       // the |ipc_server_|, it will crash the broker.  So we intentionally leak
       // that.
       if (shared_section_.IsValid())
         shared_section_.Take();
-      ipc_server_.release();
+      ignore_result(ipc_server_.release());
       sandbox_process_info_.TakeProcessHandle();
       return;
     }
   }
 
   // ipc_server_ references our process handle, so make sure the former is shut
   // down before the latter is closed (by ScopedProcessInformation).
   ipc_server_.reset();
 }
 
@@ skipping 264 matching lines @@
                                             base::win::ScopedHandle(),
                                             NULL, NULL);
   PROCESS_INFORMATION process_info = {};
   process_info.hProcess = process;
   target->sandbox_process_info_.Set(process_info);
   target->base_address_ = base_address;
   return target;
 }
 
 }  // namespace sandbox