rewrite_to_chrome_style: Use constexpr as backdoor to get consistency

third_party/WebKit/Source/platform/heap/TraceTraits.h

 // 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.
 
 #ifndef TraceTraits_h
 #define TraceTraits_h
 
 #include "platform/heap/GCInfo.h"
 #include "platform/heap/Heap.h"
 #include "platform/heap/InlinedGlobalMarkingVisitor.h"
@@ skipping 672 matching lines @@
     // weak pointers.
     // Corner case: If there is weakness on both the key and value side,
     // and there are also strong pointers on the both sides then we could
     // unexpectedly leak.  The scenario is that the weak pointer on the key
     // side is alive, which causes the strong pointer on the key side to be
     // marked.  If that then results in the object pointed to by the weak
     // pointer on the value side being marked live, then the whole
     // key-value entry is leaked.  To avoid unexpected leaking, we disallow
     // this case, but if you run into this assert, please reach out to Blink
     // reviewers, and we may relax it.
-    const bool keyIsWeak =
+    constexpr bool keyIsWeak =
         Traits::KeyTraits::weakHandlingFlag == WeakHandlingInCollections;
-    const bool valueIsWeak =
+    constexpr bool valueIsWeak =
         Traits::ValueTraits::weakHandlingFlag == WeakHandlingInCollections;
     const bool keyHasStrongRefs =
         IsTraceableInCollectionTrait<typename Traits::KeyTraits>::value;
     const bool valueHasStrongRefs =
         IsTraceableInCollectionTrait<typename Traits::ValueTraits>::value;
     static_assert(
         !keyIsWeak || !valueIsWeak || !keyHasStrongRefs || !valueHasStrongRefs,
         "this configuration is disallowed to avoid unexpected leaks");
     if ((valueIsWeak && !keyIsWeak) ||
         (valueIsWeak && keyIsWeak && !valueHasStrongRefs)) {
@@ skipping 85 matching lines @@
     // since iterating over the hash table backing will find the whole
     // chain.
     visitor->markNoTracing(node);
     return false;
   }
 };
 
 }  // namespace WTF
 
 #endif