[Cleanup] Used scoped pointers in KeyedServiceFactory's SetTestingFactory functions.

chrome/browser/ui/webui/print_preview/extension_printer_handler_unittest.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 <queue>
 #include <string>
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
@@ skipping 423 matching lines @@
       pending_printers_callbacks_;
   std::queue<PrinterProviderAPI::GetCapabilityCallback>
       pending_capability_callbacks_;
   std::queue<PrintRequestInfo> pending_print_requests_;
   std::queue<PrinterProviderAPI::GetPrinterInfoCallback>
       pending_usb_info_callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(FakePrinterProviderAPI);
 };
 
-KeyedService* BuildTestingPrinterProviderAPI(content::BrowserContext* context) {
-  return new FakePrinterProviderAPI();
+scoped_ptr<KeyedService> BuildTestingPrinterProviderAPI(
+    content::BrowserContext* context) {
+  return make_scoped_ptr(new FakePrinterProviderAPI());
 }
 
 class FakeDeviceClient : public device::DeviceClient {
  public:
   FakeDeviceClient() {}
 
   // device::DeviceClient implementation:
   device::UsbService* GetUsbService() override {
     DCHECK(usb_service_);
     return usb_service_;
@@ skipping 561 matching lines @@
       DictionaryBuilder()
           .Set("id", "printer1")
           .Set("name", "Printer 1")
           .Build());
 
   fake_api->TriggerNextUsbPrinterInfoCallback(*original_printer_info);
 
   EXPECT_EQ(0u, call_count);
   EXPECT_FALSE(printer_info.get());
 }