Fix cpplint whitespace/blank_line issues

Change-Id: Ice937e95e23dd622c17054551d4ae4cebd0ef8a2
diff --git a/runtime/thread_pool.h b/runtime/thread_pool.h
index b9f185d..7b626fb 100644
--- a/runtime/thread_pool.h
+++ b/runtime/thread_pool.h
@@ -124,9 +124,7 @@
 
 class WorkStealingTask : public Task {
  public:
-  WorkStealingTask() : ref_count_(0) {
-
-  }
+  WorkStealingTask() : ref_count_(0) {}
 
   size_t GetRefCount() const {
     return ref_count_;