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

chromeos/dbus/debug_daemon_client.cc

Index: chromeos/dbus/debug_daemon_client.cc
diff --git a/chromeos/dbus/debug_daemon_client.cc b/chromeos/dbus/debug_daemon_client.cc
index c007e2f10c6c380635be766ecfdb806c6b78ef23..6755ffc67756a851115b96a06fef9fe956031994 100644
--- a/chromeos/dbus/debug_daemon_client.cc
+++ b/chromeos/dbus/debug_daemon_client.cc
@@ -498,7 +498,9 @@ class DebugDaemonClientImpl : public DebugDaemonClient {
     dbus::MessageWriter writer(&method_call);
     writer.AppendString(name);
     writer.AppendString(uri);
-    writer.AppendString(ppd_contents);
+    writer.AppendArrayOfBytes(
+        reinterpret_cast<const uint8_t*>(ppd_contents.data()),
+        ppd_contents.size());
 
     debugdaemon_proxy_->CallMethod(
         &method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,