Move SystemLogsSource class into new file

chrome/browser/feedback/system_logs/log_sources/crash_ids_source.h

 // Copyright 2016 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_LOG_SOURCES_CRASH_IDS_SOURCE_H_
 #define CHROME_BROWSER_FEEDBACK_SYSTEM_LOGS_LOG_SOURCES_CRASH_IDS_SOURCE_H_
 
 #include <vector>
 
 #include "base/callback_forward.h"
-#include "chrome/browser/feedback/system_logs/system_logs_fetcher.h"
+#include "chrome/browser/feedback/system_logs/system_logs_source.h"
 #include "components/upload_list/crash_upload_list.h"
 #include "components/upload_list/upload_list.h"
 
 namespace system_logs {
 
 // Extract the most recent crash IDs (if any) and adds them to the system logs.
 class CrashIdsSource : public SystemLogsSource, public UploadList::Delegate {
  public:
   CrashIdsSource();
   ~CrashIdsSource() override;
@@ skipping 18 matching lines @@
 
   // True if the crash list is currently being loaded.
   bool pending_crash_list_loading_;
 
   DISALLOW_COPY_AND_ASSIGN(CrashIdsSource);
 };
 
 }  // namespace system_logs
 
 #endif  // CHROME_BROWSER_FEEDBACK_SYSTEM_LOGS_LOG_SOURCES_CRASH_IDS_SOURCE_H_