Rename TaskRunner::RunsTasksOnCurrentThread() in //extensions, //headless, //mojo

mojo/public/cpp/system/simple_watcher.cc

Index: mojo/public/cpp/system/simple_watcher.cc
diff --git a/mojo/public/cpp/system/simple_watcher.cc b/mojo/public/cpp/system/simple_watcher.cc
index 3c877495f8139f16644afd1acedc6615a4bcf353..17d1198309ba9fea8e103e31c8fc22ebcbe8f578 100644
--- a/mojo/public/cpp/system/simple_watcher.cc
+++ b/mojo/public/cpp/system/simple_watcher.cc
@@ -95,7 +95,7 @@ class SimpleWatcher::Context : public base::RefCountedThreadSafe<Context> {
     }
 
     if ((flags & MOJO_WATCHER_NOTIFICATION_FLAG_FROM_SYSTEM) &&
-        task_runner_->RunsTasksOnCurrentThread() && weak_watcher_ &&
+        task_runner_->RunsTasksInCurrentSequence() && weak_watcher_ &&
         weak_watcher_->is_default_task_runner_) {
       // System notifications will trigger from the task runner passed to
       // mojo::edk::ScopedIPCSupport. In Chrome this happens to always be the