Remove some usages of BrowserThread::UnsafeGetMessageLoopForThread

content/shell/browser/shell_browser_context.cc

Index: content/shell/browser/shell_browser_context.cc
diff --git a/content/shell/browser/shell_browser_context.cc b/content/shell/browser/shell_browser_context.cc
index 0eee3c362850b60099bbd5f4bfdba7272f094e48..4b01bf9dab73bc135d0797d757b409cc2ffcec04 100644
--- a/content/shell/browser/shell_browser_context.cc
+++ b/content/shell/browser/shell_browser_context.cc
@@ -133,8 +133,8 @@ ShellBrowserContext::CreateURLRequestContextGetter(
     URLRequestInterceptorScopedVector request_interceptors) {
   return new ShellURLRequestContextGetter(
       ignore_certificate_errors_, GetPath(),
-      BrowserThread::UnsafeGetMessageLoopForThread(BrowserThread::IO),
-      BrowserThread::UnsafeGetMessageLoopForThread(BrowserThread::FILE),
+      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO),
+      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE),
       protocol_handlers, std::move(request_interceptors), net_log_);
 }