Code cleanup and typos in trace_event [NFC]

base/trace_event/trace_category_unittest.cc

Index: base/trace_event/trace_category_unittest.cc
diff --git a/base/trace_event/trace_category_unittest.cc b/base/trace_event/trace_category_unittest.cc
index 25f37ca73982fa328e6b8d41c25626352ea52a6d..964064ebf9b09f8c2d8cf8b740d4a0cbb3ef5dbf 100644
--- a/base/trace_event/trace_category_unittest.cc
+++ b/base/trace_event/trace_category_unittest.cc
@@ -118,7 +118,7 @@ TEST_F(TraceCategoryTest, Basic) {
 }
 
 // Tries to cover the case of multiple threads creating the same category
-// simultaeously. Should never end up with distinct entries with the same name.
+// simultaneously. Should never end up with distinct entries with the same name.
 TEST_F(TraceCategoryTest, ThreadRaces) {
   const int kNumThreads = 32;
   std::unique_ptr<Thread> threads[kNumThreads];