Revert "content: Remove use of MessageLoopProxy and deprecated MessageLoop APIs"

chrome/browser/media_galleries/fileapi/safe_iapps_library_parser.cc

Index: chrome/browser/media_galleries/fileapi/safe_iapps_library_parser.cc
diff --git a/chrome/browser/media_galleries/fileapi/safe_iapps_library_parser.cc b/chrome/browser/media_galleries/fileapi/safe_iapps_library_parser.cc
index a4389b7ceed69c8554ca58711bf7d6dd2fdc5c0c..f9dafa91cfb58cd06e009024685c58e2b6f9d8d1 100644
--- a/chrome/browser/media_galleries/fileapi/safe_iapps_library_parser.cc
+++ b/chrome/browser/media_galleries/fileapi/safe_iapps_library_parser.cc
@@ -64,10 +64,10 @@ void SafeIAppsLibraryParser::StartProcessOnIOThread() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK_EQ(INITIAL_STATE, parser_state_);
 
-  scoped_refptr<base::SingleThreadTaskRunner> task_runner =
+  scoped_refptr<base::MessageLoopProxy> message_loop_proxy =
       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO);
   utility_process_host_ =
-      UtilityProcessHost::Create(this, task_runner.get())->AsWeakPtr();
+      UtilityProcessHost::Create(this, message_loop_proxy.get())->AsWeakPtr();
   utility_process_host_->SetName(l10n_util::GetStringUTF16(
       IDS_UTILITY_PROCESS_MEDIA_LIBRARY_FILE_CHECKER_NAME));
   // Wait for the startup notification before sending the main IPC to the