Fix courgette use of base/numerics

courgette/label_manager.cc

 // Copyright 2015 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.
 
 #include "courgette/label_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 159 matching lines @@
 
   size_t num_distinct_rva = 0;
   for (CRV it(rvas.begin(), rvas.end()); it.has_more(); it.advance())
     ++num_distinct_rva;
 
   // Reserve space for |labels_|, populate with sorted RVA and repeats.
   DCHECK(labels_.empty());
   labels_.reserve(num_distinct_rva);
   for (CRV it(rvas.begin(), rvas.end()); it.has_more(); it.advance()) {
     labels_.push_back(Label(*it.cur()));
-    base::CheckedNumeric<uint32_t> count = it.repeat();
-    labels_.back().count_ = count.ValueOrDie();
+    labels_.back().count_ =
+        base::checked_cast<decltype(labels_.back().count_)>(it.repeat());
   }
 }
 
 }  // namespace courgette