Define the Settings interface for a CrashReportDatabase and provide a Mac implementation.

client/crash_report_database_win.cc

Index: client/crash_report_database_win.cc
diff --git a/client/crash_report_database_win.cc b/client/crash_report_database_win.cc
index 84ed6e2291a8bea223f3629b1f73a6620c5c7abd..a80046c16682eb330aa35210ac0651b8d4dff116 100644
--- a/client/crash_report_database_win.cc
+++ b/client/crash_report_database_win.cc
@@ -524,6 +524,7 @@ class CrashReportDatabaseWin : public CrashReportDatabase {
   bool Initialize();
 
   // CrashReportDatabase:
+  Settings* GetSettings() override;
   OperationStatus PrepareNewCrashReport(NewReport** report) override;
   OperationStatus FinishedWritingCrashReport(NewReport* report,
                                              UUID* uuid) override;
@@ -565,6 +566,12 @@ bool CrashReportDatabaseWin::Initialize() {
   return true;
 }
 
+Settings* CrashReportDatabaseWin::GetSettings() {
+  // Port to Win https://code.google.com/p/crashpad/issues/detail?id=13.
+  NOTREACHED();
+  return nullptr;
+}
+
 OperationStatus CrashReportDatabaseWin::PrepareNewCrashReport(
     NewReport** report) {
   ::UUID system_uuid;