Speculative fix for memory leak in media galleries preferences unit test.

BUG=141322


Review URL: https://chromiumcodereview.appspot.com/10855132

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151382 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/media_gallery/media_galleries_preferences_unittest.cc

@@ -48,6 +48,7 @@ class MediaGalleriesPreferencesTest : public testing::Test {
   virtual ~MediaGalleriesPreferencesTest() {
     // TestExtensionSystem uses DeleteSoon, so we need to delete the profile
     // and then run the message queue to clean up.
+    MessageLoop::current()->RunAllPending();
     profile_.reset();
     MessageLoop::current()->RunAllPending();
   }