Aura on Android: Stub implementation of UsbPrinterManifestHandler.

extensions/common/api/printer_provider/usb_printer_manifest_handler_android.cc

 // Copyright 2015 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.
 
 #include "extensions/common/api/printer_provider/usb_printer_manifest_handler.h"
 
-#include "extensions/common/api/printer_provider/usb_printer_manifest_data.h"
 #include "extensions/common/extension.h"
-#include "extensions/common/manifest_constants.h"
 
 namespace extensions {
 
 UsbPrinterManifestHandler::UsbPrinterManifestHandler() {
 }
 
 UsbPrinterManifestHandler::~UsbPrinterManifestHandler() {
 }
 
 bool UsbPrinterManifestHandler::Parse(Extension* extension,
                                       base::string16* error) {
-  const base::Value* usb_printers = nullptr;
-  CHECK(extension->manifest()->Get(manifest_keys::kUsbPrinters, &usb_printers));
-  scoped_ptr<UsbPrinterManifestData> data =
-      UsbPrinterManifestData::FromValue(*usb_printers, error);
-  if (!data) {
-    return false;
-  }
-
-  extension->SetManifestData(manifest_keys::kUsbPrinters, data.release());
-  return true;
+  return false;
 }
 
 const std::vector<std::string> UsbPrinterManifestHandler::Keys() const {
-  return SingleKey(manifest_keys::kUsbPrinters);
+  return std::vector<std::string>();
 }
 
 }  // namespace extensions