Remove BrowserThread::UnsafeGetBrowserThread, add UnsafeGetMessageLoopForThread.

chrome/browser/printing/printer_manager_dialog_win.cc

Index: chrome/browser/printing/printer_manager_dialog_win.cc
diff --git a/chrome/browser/printing/printer_manager_dialog_win.cc b/chrome/browser/printing/printer_manager_dialog_win.cc
index 8c94d071acd5023df2b07108aaf54140fba870e3..1a1121cdabf9bde0e6e9774170ce56bae78a9ace 100644
--- a/chrome/browser/printing/printer_manager_dialog_win.cc
+++ b/chrome/browser/printing/printer_manager_dialog_win.cc
@@ -12,6 +12,9 @@
 #include "base/path_service.h"
 #include "base/threading/thread.h"
 #include "chrome/browser/browser_process.h"
+#include "content/public/browser/browser_thread.h"
+
+using content::BrowserThread;
 
 namespace printing {
 
@@ -29,8 +32,10 @@ void OpenPrintersDialogCallback() {
 }
 
 void PrinterManagerDialog::ShowPrinterManagerDialog() {
-  g_browser_process->file_thread()->message_loop()->PostTask(
-      FROM_HERE, base::Bind(OpenPrintersDialogCallback));
+  BrowserThread::PostTask(
+      BrowserThread::FILE,
+      FROM_HERE,
+      base::Bind(OpenPrintersDialogCallback));
 }
 
 }  // namespace printing