Update PpdProvider threading model.

chromeos/printing/ppd_provider_unittest.cc

 // 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.
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ skipping 56 matching lines @@
   PpdProviderTest()
       : loop_(base::MessageLoop::TYPE_IO),
         request_context_getter_(
             new net::TestURLRequestContextGetter(loop_.task_runner().get())) {}
 
   void SetUp() override {
     ASSERT_TRUE(ppd_cache_temp_dir_.CreateUniqueTempDir());
     auto provider_options = PpdProvider::Options();
     provider_options.quirks_server = kTestQuirksServer;
     ppd_provider_ = PpdProvider::Create(
-        kTestAPIKey, request_context_getter_,
+        kTestAPIKey, request_context_getter_.get(), loop_.task_runner().get(),
         PpdCache::Create(ppd_cache_temp_dir_.GetPath()), provider_options);
   }
 
  protected:
   base::ScopedTempDir ppd_cache_temp_dir_;
 
   // Provider to be used in the test.
   std::unique_ptr<PpdProvider> ppd_provider_;
 
   // Misc extra stuff needed for the test environment to function.
@@ skipping 167 matching lines @@
   available_printers.clear();
   ppd_provider_->QueryAvailable(query_callback);
   base::RunLoop().RunUntilIdle();
   EXPECT_EQ(PpdProvider::SUCCESS, result_code);
   EXPECT_EQ(QuirksPrinters(), available_printers);
 }
 
 }  // namespace
 }  // namespace printing
 }  // namespace chromeos