Remove MessageLoop::current() from browser_context.cc.

content/browser/browser_context.cc

Index: content/browser/browser_context.cc
diff --git a/content/browser/browser_context.cc b/content/browser/browser_context.cc
index 5b7ba414fede1cfde3b029ed98f7b60c0ca2b418..a7c63e5152f874ef40c5423cf0d9e89e706822e5 100644
--- a/content/browser/browser_context.cc
+++ b/content/browser/browser_context.cc
@@ -431,7 +431,7 @@ void BrowserContext::Initialize(
 
   ServiceManagerConnection* service_manager_connection =
       ServiceManagerConnection::GetForProcess();
-  if (service_manager_connection && base::MessageLoop::current()) {
+  if (service_manager_connection && base::ThreadTaskRunnerHandle::IsSet()) {
     // NOTE: Many unit tests create a TestBrowserContext without initializing
     // Mojo or the global service manager connection.