Add CrashReportDatabase::ErrorWritingCrashReport()

client/crash_report_database_mac.mm

Index: client/crash_report_database_mac.mm
diff --git a/client/crash_report_database_mac.mm b/client/crash_report_database_mac.mm
index fe3e13a360a465531ac08d0182ff6532d0da32ec..1b54d1eff6ab174a622977e26c8fe8ec0ef978ba 100644
--- a/client/crash_report_database_mac.mm
+++ b/client/crash_report_database_mac.mm
@@ -109,6 +109,7 @@ class CrashReportDatabaseMac : public CrashReportDatabase {
   OperationStatus PrepareNewCrashReport(NewReport** report) override;
   OperationStatus FinishedWritingCrashReport(NewReport* report,
                                              UUID* uuid) override;
+  OperationStatus ErrorWritingCrashReport(NewReport* report) override;
   OperationStatus LookUpCrashReport(const UUID& uuid,
                                     Report* report) override;
   OperationStatus GetPendingReports(
@@ -280,6 +281,24 @@ CrashReportDatabaseMac::FinishedWritingCrashReport(NewReport* report,
 }
 
 CrashReportDatabase::OperationStatus
+CrashReportDatabaseMac::ErrorWritingCrashReport(NewReport* report) {
+  // Takes ownership of the |handle| and the O_EXLOCK.
+  base::ScopedFD lock(report->handle);
+
+  // Take ownership of the report.
+  scoped_ptr<NewReport> scoped_report(report);
+
+  // Remove the file that the report would have been written to had no error
+  // occurred.
+  if (unlink(report->path.value().c_str()) != 0) {
+    PLOG(ERROR) << "unlink " << report->path.value();
+    return kFileSystemError;
+  }
+
+  return kNoError;
+}
+
+CrashReportDatabase::OperationStatus
 CrashReportDatabaseMac::LookUpCrashReport(const UUID& uuid,
                                           CrashReportDatabase::Report* report) {
   base::FilePath path = LocateCrashReport(uuid);