Fix off-by-one error in counter array sizing in BlimpStats.

blimp/net/blimp_stats.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 BLIMP_NET_BLIMP_STATS_H_
 #define BLIMP_NET_BLIMP_STATS_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 31 matching lines @@
   friend struct base::DefaultLazyInstanceTraits<BlimpStats>;
 
   static base::LazyInstance<BlimpStats> instance_;
 
   BlimpStats();
   ~BlimpStats();
 
   // Values must be read or modified using base::subtle::NoBarrier* functions.
   // We are using the NoBarrier* functions because we value performance over
   // accuracy of the data.
-  base::subtle::Atomic32 values_[EVENT_TYPE_MAX];
+  base::subtle::Atomic32 values_[EVENT_TYPE_MAX + 1];
 
   DISALLOW_COPY_AND_ASSIGN(BlimpStats);
 };
 
 }  // namespace blimp
 
 #endif  // BLIMP_NET_BLIMP_STATS_H_