Optimize sending sys info to the feedback app

chrome/browser/feedback/system_logs/system_logs_fetcher_base.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_FEEDBACK_SYSTEM_LOGS_SYSTEM_LOGS_FETCHER_BASE_H_
 #define CHROME_BROWSER_FEEDBACK_SYSTEM_LOGS_SYSTEM_LOGS_FETCHER_BASE_H_
 
 #include <stddef.h>
 
 #include <map>
 #include <memory>
 #include <string>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
+#include "components/feedback/feedback_common.h"
 
 namespace system_logs {
 
-typedef std::map<std::string, std::string> SystemLogsResponse;
+using SystemLogsResponse = FeedbackCommon::SystemLogsMap;
 
 // Callback that the data sources use to return data.
-typedef base::Callback<void(SystemLogsResponse* response)>
-    SysLogsSourceCallback;
+using SysLogsSourceCallback = base::Callback<void(SystemLogsResponse*)>;
 
 // Callback that the SystemLogsFetcherBase uses to return data.
-typedef base::Callback<void(std::unique_ptr<SystemLogsResponse> response)>
-    SysLogsFetcherCallback;
+using SysLogsFetcherCallback =
+    base::Callback<void(std::unique_ptr<SystemLogsResponse>)>;
 
 // The SystemLogsSource provides a interface for the data sources that
 // the SystemLogsFetcherBase class uses to fetch logs and other
 // information.
 class SystemLogsSource {
  public:
   // |source_name| provides a descriptive identifier for debugging.
   explicit SystemLogsSource(const std::string& source_name);
   virtual ~SystemLogsSource();
 
@@ skipping 50 matching lines @@
   size_t num_pending_requests_;   // The number of callbacks it should get.
 
  private:
 
   DISALLOW_COPY_AND_ASSIGN(SystemLogsFetcherBase);
 };
 
 }  // namespace system_logs
 
 #endif  // CHROME_BROWSER_FEEDBACK_SYSTEM_LOGS_SYSTEM_LOGS_FETCHER_BASE_H_