For c++, Generate enum classes instead of enum from mojom.

services/native_support/process_controller_impl.cc

 // Copyright 2015 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 "services/native_support/process_controller_impl.h"
 
 #include <errno.h>
 #include <signal.h>
 #include <sys/types.h>
 
@@ skipping 12 matching lines @@
 namespace native_support {
 
 namespace {
 
 void WaitForProcess(
     base::Process process,
     scoped_refptr<base::TaskRunner> done_runner,
     const base::Callback<void(mojo::files::Error, int32_t)>& done_callback) {
   int exit_status = 0;
   mojo::files::Error result = process.WaitForExit(&exit_status)
-                                  ? mojo::files::ERROR_OK
-                                  : mojo::files::ERROR_UNKNOWN;
+                                  ? mojo::files::Error::OK
+                                  : mojo::files::Error::UNKNOWN;
   done_runner->PostTask(
       FROM_HERE,
       base::Bind(done_callback, result, static_cast<int32_t>(exit_status)));
 }
 
 void TerminateProcess(base::Process process) {
   if (!process.Terminate(-1, true))
     LOG(ERROR) << "Failed to kill PID " << process.Pid();
 }
 
@@ skipping 15 matching lines @@
 ProcessControllerImpl::~ProcessControllerImpl() {
   if (process_.IsValid()) {
     worker_runner_->PostTask(
         FROM_HERE, base::Bind(&TerminateProcess, base::Passed(&process_)));
   }
 }
 
 void ProcessControllerImpl::Wait(const WaitCallback& callback) {
   if (!process_.IsValid()) {
     // TODO(vtl): This isn't quite right.
-    callback.Run(mojo::files::ERROR_UNAVAILABLE, 0);
+    callback.Run(mojo::files::Error::UNAVAILABLE, 0);
     return;
   }
 
   worker_runner_->PostTask(
       FROM_HERE, base::Bind(&WaitForProcess, base::Passed(&process_),
                             base::MessageLoop::current()->task_runner(),
                             base::Bind(&ProcessControllerImpl::OnWaitComplete,
                                        weak_factory_.GetWeakPtr(), callback)));
 }
 
 void ProcessControllerImpl::Kill(int32_t signal, const KillCallback& callback) {
   callback.Run(KillHelper(signal));
 }
 
 void ProcessControllerImpl::OnWaitComplete(const WaitCallback& callback,
                                            mojo::files::Error result,
                                            int32_t exit_status) {
   callback.Run(result, exit_status);
 }
 
 mojo::files::Error ProcessControllerImpl::KillHelper(int32_t signal) {
   if (signal < 0)
-    return mojo::files::ERROR_INVALID_ARGUMENT;
+    return mojo::files::Error::INVALID_ARGUMENT;
 
   if (!process_.IsValid()) {
     LOG(ERROR) << "Kill() called after Wait()";
     // TODO(vtl): This error code isn't quite right, but "unavailable" (which
     // would also be wrong) is used for a more appropriate purpose below.
-    return mojo::files::ERROR_INVALID_ARGUMENT;
+    return mojo::files::Error::INVALID_ARGUMENT;
   }
 
   // |base::HandleType| is just a typedef for |pid_t|.
   pid_t pid = process_.Handle();
 
   // Note: |kill()| is not interruptible.
   if (kill(pid, static_cast<int>(signal)) == 0)
-    return mojo::files::ERROR_OK;
+    return mojo::files::Error::OK;
 
   switch (errno) {
     case EINVAL:
-      return mojo::files::ERROR_INVALID_ARGUMENT;
+      return mojo::files::Error::INVALID_ARGUMENT;
     case EPERM:
-      return mojo::files::ERROR_PERMISSION_DENIED;
+      return mojo::files::Error::PERMISSION_DENIED;
     case ESRCH:
-      return mojo::files::ERROR_UNAVAILABLE;
+      return mojo::files::Error::UNAVAILABLE;
     default:
       break;
   }
-  return mojo::files::ERROR_UNKNOWN;
+  return mojo::files::Error::UNKNOWN;
 }
 
 }  // namespace native_support