Completely rewrite the PpdProvider/PpdCache to use the SCS backend. Along the way, clean it up a l…

chromeos/printing/printing_constants.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 CHROMEOS_PRINTING_PRINTING_CONSTANTS_H_
+#define CHROMEOS_PRINTING_PRINTING_CONSTANTS_H_
+
+namespace chromeos {
+namespace printing {
+
+// Maximum size of a PPD file that we will accept, currently 250k.  This number
+// is relatively
+// arbitrary, we just don't want to try to handle ridiculously huge files.
+constexpr size_t kMaxPpdSizeBytes = 250 * 1024;
+
+}  // namespace printing
+}  // namespace chromeos
+
+#endif  // CHROMEOS_PRINTING_PRINTING_CONSTANTS_H_