Remove calls to deprecated MessageLoop methods in chrome.

chrome/browser/extensions/api/top_sites/top_sites_apitest.cc

Index: chrome/browser/extensions/api/top_sites/top_sites_apitest.cc
diff --git a/chrome/browser/extensions/api/top_sites/top_sites_apitest.cc b/chrome/browser/extensions/api/top_sites/top_sites_apitest.cc
index f44d84b8f8f9855f9d88f72b461e3a5bdec3a1b5..bf4c77713092ff25cf6446fcf4b3ee5dfc259464 100644
--- a/chrome/browser/extensions/api/top_sites/top_sites_apitest.cc
+++ b/chrome/browser/extensions/api/top_sites/top_sites_apitest.cc
@@ -4,6 +4,7 @@
 
 #include <stddef.h>
 
+#include "base/run_loop.h"
 #include "base/values.h"
 #include "build/build_config.h"
 #include "chrome/browser/extensions/api/top_sites/top_sites_api.h"
@@ -42,7 +43,7 @@ class TopSitesExtensionTest : public InProcessBrowserTest {
 
     if (!top_sites_inited_) {
       waiting_ = true;
-      base::MessageLoop::current()->Run();
+      base::RunLoop().Run();
     }
 
     // By this point, we know topsites has loaded. We can run the tests now.