Add functionality to prune old crash reports from the database.

client/crash_report_database.h

 // Copyright 2015 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 282 matching lines @@
   //!     without the report being uploaded.
   //!
   //! This can be used if the user has disabled crash report collection, but
   //! crash generation is still enabled in the product.
   //!
   //! \param[in] uuid The unique identifier for the crash report record.
   //!
   //! \return The operation status code.
   virtual OperationStatus SkipReportUpload(const UUID& uuid) = 0;
 
+  //! \brief Deletes a crash report file and its associated metadata.
+  //!
+  //! \param[in] uuid The UUID of the report to delete.
+  //!
+  //! \return The operation status code.
+  virtual OperationStatus DeleteReport(const UUID& uuid) = 0;
+
  protected:
   CrashReportDatabase() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CrashReportDatabase);
 };
 
 }  // namespace crashpad
 
 #endif  // CRASHPAD_CLIENT_CRASH_REPORT_DATABASE_H_