Fix a typo: RemoveActivity should be called on Remove.

TBR=oshima@chromium.org
TEST=None
BUG=None

Review URL: https://codereview.chromium.org/311943003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274811 0039d316-1c4b-4281-b951-d872f2087c98

athena/activity/activity_manager_impl.cc

@@ -45,7 +45,7 @@ class ActivityManagerImpl : public ActivityManager {
       activities_.erase(find);
 
       ActivityViewManager* manager = ActivityViewManager::Get();
-      manager->AddActivity(activity);
+      manager->RemoveActivity(activity);
     }
   }