Create a class to represent a DOM Storage Database.

sql/diagnostic_error_delegate.h

Index: sql/diagnostic_error_delegate.h
diff --git a/sql/diagnostic_error_delegate.h b/sql/diagnostic_error_delegate.h
index 6a09fc0ef4c05da883c9b7b5a6e3ce6688be2eae..dd57f100214d919f47cd59a86a23ed92f9fc3fb5 100644
--- a/sql/diagnostic_error_delegate.h
+++ b/sql/diagnostic_error_delegate.h
@@ -28,9 +28,9 @@ class DiagnosticErrorDelegate : public ErrorDelegate {
 
   virtual int OnError(int error, Connection* connection,
                       Statement* stmt) {
-    NOTREACHED() << "sqlite error " << error
-                 << ", errno " << connection->GetLastErrno()
-                 << ": " << connection->GetErrorMessage();
+    LOG(ERROR) << "sqlite error " << error
+               << ", errno " << connection->GetLastErrno()
+               << ": " << connection->GetErrorMessage();
     RecordErrorInHistogram(error);
     return error;
   }