Update extensions/ to use scoped_refptr<T>::get() rather than implicit "operator T*"

extensions/common/one_shot_event.cc

Index: extensions/common/one_shot_event.cc
diff --git a/extensions/common/one_shot_event.cc b/extensions/common/one_shot_event.cc
index e654e3e199111cb6ee9c743172694db0ac587420..318acad5c6b9ee2457a32236c2f4028fbe5d342b 100644
--- a/extensions/common/one_shot_event.cc
+++ b/extensions/common/one_shot_event.cc
@@ -19,7 +19,7 @@ struct OneShotEvent::TaskInfo {
            const scoped_refptr<TaskRunner>& runner,
            const base::Closure& task)
       : from_here(from_here), runner(runner), task(task) {
-    CHECK(runner);  // Detect mistakes with a decent stack frame.
+    CHECK(runner.get());  // Detect mistakes with a decent stack frame.
   }
   tracked_objects::Location from_here;
   scoped_refptr<TaskRunner> runner;