Remove all remaining traces of MessageLoopProxy.

chrome/browser/ui/webui/settings/certificates_handler.cc

Index: chrome/browser/ui/webui/settings/certificates_handler.cc
diff --git a/chrome/browser/ui/webui/settings/certificates_handler.cc b/chrome/browser/ui/webui/settings/certificates_handler.cc
index 462257144ea7a564e088a49df29f0ccaad0a82e7..fd7d055a7ec17482724c63c268352355de33817c 100644
--- a/chrome/browser/ui/webui/settings/certificates_handler.cc
+++ b/chrome/browser/ui/webui/settings/certificates_handler.cc
@@ -300,7 +300,7 @@ base::CancelableTaskTracker::TaskId FileAccessProvider::StartRead(
 
   // Post task to file thread to read file.
   return tracker->PostTaskAndReply(
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE).get(),
+      BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE).get(),
       FROM_HERE,
       base::Bind(&FileAccessProvider::DoRead, this, path, saved_errno, data),
       base::Bind(callback, base::Owned(saved_errno), base::Owned(data)));
@@ -317,7 +317,7 @@ base::CancelableTaskTracker::TaskId FileAccessProvider::StartWrite(
 
   // Post task to file thread to write file.
   return tracker->PostTaskAndReply(
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE).get(),
+      BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE).get(),
       FROM_HERE, base::Bind(&FileAccessProvider::DoWrite, this, path, data,
                             saved_errno, bytes_written),
       base::Bind(callback, base::Owned(saved_errno),