Switch OmahaEvent's error_code to ActionExitCode.

omaha_request_action.h

 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_OMAHA_REQUEST_ACTION_H__
 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_OMAHA_REQUEST_ACTION_H__
 
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <fcntl.h>
@@ skipping 49 matching lines @@
   };
 
   enum Result {
     kResultError = 0,
     kResultSuccess = 1,
   };
 
   OmahaEvent()
       : type(kTypeUnknown),
         result(kResultError),
-        error_code(0) {}
-  OmahaEvent(Type in_type, Result in_result, int in_error_code)
+        error_code(kActionCodeError) {}
+  explicit OmahaEvent(Type in_type)
+      : type(in_type),
+        result(kResultSuccess),
+        error_code(kActionCodeSuccess) {}
+  OmahaEvent(Type in_type, Result in_result, ActionExitCode in_error_code)
       : type(in_type),
         result(in_result),
         error_code(in_error_code) {}
 
   Type type;
   Result result;
-  int error_code;
+  ActionExitCode error_code;
 };
 
 class NoneType;
 class OmahaRequestAction;
 struct OmahaRequestParams;
 
 template<>
 class ActionTraits<OmahaRequestAction> {
  public:
   // Takes parameters on the input pipe.
@@ skipping 53 matching lines @@
 
   // Stores the response from the omaha server
   std::vector<char> response_buffer_;
 
   DISALLOW_COPY_AND_ASSIGN(OmahaRequestAction);
 };
 
 }  // namespace chromeos_update_engine
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_OMAHA_REQUEST_ACTION_H__