Code cleanup and typos in trace_event [NFC]

base/trace_event/blame_context.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_TRACE_EVENT_BLAME_CONTEXT_H_
 #define BASE_TRACE_EVENT_BLAME_CONTEXT_H_
 
 #include <inttypes.h>
 
 #include "base/base_export.h"
@@ skipping 64 matching lines @@
   // enabled. Must be called before any other methods on this class.
   void Initialize();
 
   // Indicate that the current thread is now doing work which should count
   // against this blame context.  This function is allowed to be called in a
   // thread different from where the blame context was created; However, any
   // client doing that must be fully responsible for ensuring thready safety.
   void Enter();
 
   // Leave and stop doing work for a previously entered blame context. If
-  // another blame context belongin to the same tree was entered prior to this
+  // another blame context belonging to the same tree was entered prior to this
   // one, it becomes the active blame context for this thread again.  Similar
   // to Enter(), this function can be called in a thread different from where
   // the blame context was created, and the same requirement on thread safety
   // must be satisfied.
   void Leave();
 
   // Record a snapshot of the blame context. This is normally only needed if a
   // blame context subclass defines custom properties (see AsValueInto) and one
   // or more of those properties have changed.
   void TakeSnapshot();
@@ skipping 33 matching lines @@
   ThreadChecker thread_checker_;
   WeakPtrFactory<BlameContext> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BlameContext);
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_BLAME_CONTEXT_H_