Remove all remaining traces of MessageLoopProxy.

content/browser/download/download_browsertest.cc

Index: content/browser/download/download_browsertest.cc
diff --git a/content/browser/download/download_browsertest.cc b/content/browser/download/download_browsertest.cc
index ab09c1d06c6c4939c6362ec98d397652731f7681..d9da7e8fb9f7d981adeb64a4f18089bef6988622 100644
--- a/content/browser/download/download_browsertest.cc
+++ b/content/browser/download/download_browsertest.cc
@@ -259,8 +259,8 @@ DownloadFile* DownloadFileWithDelayFactory::CreateFile(
   std::unique_ptr<device::PowerSaveBlocker> psb(new device::PowerSaveBlocker(
       device::PowerSaveBlocker::kPowerSaveBlockPreventAppSuspension,
       device::PowerSaveBlocker::kReasonOther, "Download in progress",
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::UI),
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE)));
+      BrowserThread::GetTaskRunnerForThread(BrowserThread::UI),
+      BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE)));
   return new DownloadFileWithDelay(std::move(save_info),
                                    default_download_directory,
                                    std::move(stream),
@@ -358,8 +358,8 @@ class CountingDownloadFileFactory : public DownloadFileFactory {
     std::unique_ptr<device::PowerSaveBlocker> psb(new device::PowerSaveBlocker(
         device::PowerSaveBlocker::kPowerSaveBlockPreventAppSuspension,
         device::PowerSaveBlocker::kReasonOther, "Download in progress",
-        BrowserThread::GetMessageLoopProxyForThread(BrowserThread::UI),
-        BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE)));
+        BrowserThread::GetTaskRunnerForThread(BrowserThread::UI),
+        BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE)));
     return new CountingDownloadFile(std::move(save_info),
                                     default_downloads_directory,
                                     std::move(stream),