Use ScopedTaskEnvironment instead of MessageLoop in RenderViewTest.

components/printing/test/print_web_view_helper_browsertest.cc

 // Copyright (c) 2012 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 "components/printing/renderer/print_web_view_helper.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <tuple>
@@ skipping 154 matching lines @@
     // Do this before shutting down V8 in RenderViewTest::TearDown().
     // http://crbug.com/328552
     __lsan_do_leak_check();
 #endif
 
     content::RenderViewTest::TearDown();
   }
 
   void PrintWithJavaScript() {
     ExecuteJavaScriptForTests("window.print();");
-    ProcessPendingMessages();
+    base::RunLoop().RunUntilIdle();
   }
 
   // The renderer should be done calculating the number of rendered pages
   // according to the specified settings defined in the mock render thread.
   // Verify the page count is correct.
   void VerifyPageCount(int expected_count) {
 #if defined(OS_CHROMEOS)
     // The DidGetPrintedPagesCount message isn't sent on ChromeOS. Right now we
     // always print all pages, and there are checks to that effect built into
     // the print code.
@@ skipping 49 matching lines @@
     if (did_print) {
       PrintHostMsg_DidPrintPage::Param post_did_print_page_param;
       PrintHostMsg_DidPrintPage::Read(print_msg, &post_did_print_page_param);
       EXPECT_EQ(0, std::get<0>(post_did_print_page_param).page_number);
     }
   }
 
 #if BUILDFLAG(ENABLE_BASIC_PRINTING)
   void OnPrintPages() {
     GetPrintWebViewHelper()->OnPrintPages();
-    ProcessPendingMessages();
+    base::RunLoop().RunUntilIdle();
   }
 #endif  // BUILDFLAG(ENABLE_BASIC_PRINTING)
 
 #if BUILDFLAG(ENABLE_PRINT_PREVIEW)
   void VerifyPreviewRequest(bool expect_request) {
     const IPC::Message* print_msg =
         render_thread_->sink().GetUniqueMessageMatching(
             PrintHostMsg_SetupScriptedPrintPreview::ID);
     bool got_preview_request = !!print_msg;
     EXPECT_EQ(expect_request, got_preview_request);
   }
 
   void OnPrintPreview(const base::DictionaryValue& dict) {
     PrintWebViewHelper* print_web_view_helper = GetPrintWebViewHelper();
     print_web_view_helper->OnInitiatePrintPreview(false);
     base::RunLoop run_loop;
     DidPreviewPageListener filter(&run_loop);
     render_thread_->sink().AddFilter(&filter);
     print_web_view_helper->OnPrintPreview(dict);
     run_loop.Run();
     render_thread_->sink().RemoveFilter(&filter);
   }
 #endif  // BUILDFLAG(ENABLE_PRINT_PREVIEW)
 
 #if BUILDFLAG(ENABLE_BASIC_PRINTING)
   void OnPrintForPrintPreview(const base::DictionaryValue& dict) {
     GetPrintWebViewHelper()->OnPrintForPrintPreview(dict);
-    ProcessPendingMessages();
+    base::RunLoop().RunUntilIdle();
   }
 #endif  // BUILDFLAG(ENABLE_BASIC_PRINTING)
 
   PrintWebViewHelper* GetPrintWebViewHelper() {
     return PrintWebViewHelper::Get(
         content::RenderFrame::FromWebFrame(GetMainFrame()));
   }
 
   // Naked pointer as ownership is with content::RenderViewTest::render_thread_.
   PrintMockRenderThread* print_render_thread_;
@@ skipping 74 matching lines @@
   blink::WebMouseEvent mouse_event(blink::WebInputEvent::kMouseDown,
                                    blink::WebInputEvent::kNoModifiers,
                                    blink::WebInputEvent::kTimeStampForTesting);
   mouse_event.button = blink::WebMouseEvent::Button::kLeft;
   mouse_event.SetPositionInWidget(bounds.CenterPoint().x(),
                                   bounds.CenterPoint().y());
   mouse_event.click_count = 1;
   SendWebMouseEvent(mouse_event);
   mouse_event.SetType(blink::WebInputEvent::kMouseUp);
   SendWebMouseEvent(mouse_event);
-  ProcessPendingMessages();
+  base::RunLoop().RunUntilIdle();
 
   VerifyPageCount(1);
   VerifyPagesPrinted(true);
 }
 
 // Duplicate of OnPrintPagesTest only using javascript to print.
 TEST_F(MAYBE_PrintWebViewHelperTest, PrintWithJavascript) {
   PrintWithJavaScript();
 
   VerifyPageCount(1);
@@ skipping 775 matching lines @@
 
   VerifyPrintFailed(true);
   VerifyPagesPrinted(false);
 }
 #endif  // BUILDFLAG(ENABLE_BASIC_PRINTING)
 #endif  // BUILDFLAG(ENABLE_PRINT_PREVIEW)
 
 #endif  // !defined(OS_CHROMEOS)
 
 }  // namespace printing