Fix cpplint whitespace/blank_line issues

Change-Id: Ice937e95e23dd622c17054551d4ae4cebd0ef8a2
diff --git a/runtime/thread_pool_test.cc b/runtime/thread_pool_test.cc
index 9b66318..98178bc 100644
--- a/runtime/thread_pool_test.cc
+++ b/runtime/thread_pool_test.cc
@@ -105,9 +105,7 @@
   TreeTask(ThreadPool* const thread_pool, AtomicInteger* count, int depth)
       : thread_pool_(thread_pool),
         count_(count),
-        depth_(depth) {
-
-  }
+        depth_(depth) {}
 
   void Run(Thread* self) {
     if (depth_ > 1) {