Use TaskScheduler instead of WorkerPool in extension_printer_handler.cc.

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 "chrome/browser/ui/webui/print_preview/extension_printer_handler.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <queue>
 #include <string>
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "base/strings/string16.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/test/values_test_util.h"
-#include "base/threading/thread_task_runner_handle.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/test_extension_environment.h"
 #include "chrome/browser/printing/pwg_raster_converter.h"
 #include "chrome/test/base/testing_profile.h"
 #include "components/version_info/version_info.h"
 #include "device/base/mock_device_client.h"
 #include "device/usb/mock_usb_device.h"
 #include "device/usb/mock_usb_service.h"
 #include "extensions/browser/api/device_permissions_manager.h"
 #include "extensions/browser/api/printer_provider/printer_provider_api.h"
@@ skipping 419 matching lines @@
 }  // namespace
 
 class ExtensionPrinterHandlerTest : public testing::Test {
  public:
   ExtensionPrinterHandlerTest() : pwg_raster_converter_(NULL) {}
   ~ExtensionPrinterHandlerTest() override = default;
 
   void SetUp() override {
     extensions::PrinterProviderAPIFactory::GetInstance()->SetTestingFactory(
         env_.profile(), &BuildTestingPrinterProviderAPI);
-    extension_printer_handler_.reset(new ExtensionPrinterHandler(
-        env_.profile(), base::ThreadTaskRunnerHandle::Get()));
+    extension_printer_handler_.reset(
+        new ExtensionPrinterHandler(env_.profile()));
 
     pwg_raster_converter_ = new FakePWGRasterConverter();
     extension_printer_handler_->SetPWGRasterConverterForTesting(
         std::unique_ptr<PWGRasterConverter>(pwg_raster_converter_));
   }
 
  protected:
   FakePrinterProviderAPI* GetPrinterProviderAPI() {
     return static_cast<FakePrinterProviderAPI*>(
         extensions::PrinterProviderAPIFactory::GetInstance()
@@ skipping 530 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());
 }