Remove calls to deprecated MessageLoop methods in extensions.

extensions/browser/extension_icon_image_unittest.cc

Index: extensions/browser/extension_icon_image_unittest.cc
diff --git a/extensions/browser/extension_icon_image_unittest.cc b/extensions/browser/extension_icon_image_unittest.cc
index 71a3964fd64c242e63b3fc869b6c8d43c534967f..d839635784933a40fafaf86b8fbcc3af2351c7ca 100644
--- a/extensions/browser/extension_icon_image_unittest.cc
+++ b/extensions/browser/extension_icon_image_unittest.cc
@@ -10,6 +10,7 @@
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
+#include "base/run_loop.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/test/test_browser_context.h"
 #include "content/public/test/test_browser_thread.h"
@@ -82,7 +83,7 @@ class ExtensionIconImageTest : public ExtensionsTest,
 
   void WaitForImageLoad() {
     quit_in_image_loaded_ = true;
-    base::MessageLoop::current()->Run();
+    base::RunLoop().Run();
     quit_in_image_loaded_ = false;
   }