Deprecate FLAGS_quic_enable_arena_allocation.

net/quic/quic_one_block_arena.h

 // Copyright (c) 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.
 
 // An arena that consists of a single inlined block of |ArenaSize|. Useful to
 // avoid repeated calls to malloc/new and to improve memory locality. DCHECK's
 // if an allocation out of the arena ever fails in debug builds; falls back to
 // heap allocation in release builds.
 
 #ifndef NET_QUIC_QUIC_ONE_BLOCK_ARENA_H_
@@ skipping 41 matching lines @@
 QuicOneBlockArena<ArenaSize>::QuicOneBlockArena()
     : offset_(0) {}
 
 template <uint32_t ArenaSize>
 template <typename T, typename... Args>
 QuicArenaScopedPtr<T> QuicOneBlockArena<ArenaSize>::New(Args&&... args) {
   DCHECK_LT(AlignedSize<T>(), ArenaSize)
       << "Object is too large for the arena.";
   static_assert(QUIC_ALIGN_OF(T) > 1,
                 "Objects added to the arena must be at least 2B aligned.");
-  if (!FLAGS_quic_enable_arena_allocation) {
-    return QuicArenaScopedPtr<T>(new T(std::forward<Args>(args)...));
-  }
   if (PREDICT_FALSE(offset_ > ArenaSize - AlignedSize<T>())) {
     LOG(DFATAL) << "Ran out of space in QuicOneBlockArena at " << this
                 << ", max size was " << ArenaSize << ", failing request was "
                 << AlignedSize<T>() << ", end of arena was " << offset_;
     return QuicArenaScopedPtr<T>(new T(std::forward<Args>(args)...));
   }
 
   void* buf = &storage_[offset_];
   new (buf) T(std::forward<Args>(args)...);
   offset_ += AlignedSize<T>();
   return QuicArenaScopedPtr<T>(buf,
                                QuicArenaScopedPtr<T>::ConstructFrom::kArena);
 }
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_ONE_BLOCK_ARENA_H_