Revert of Test RTC_DCHECK_IS_ON instead of checking DCHECK_ALWAYS_ON everywhere

webrtc/base/buffer.h

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 331 matching lines @@
   // Postcondition for all methods except move construction and move
   // assignment, which leave the moved-from object in a possibly inconsistent
   // state.
   bool IsConsistent() const {
     return (data_ || capacity_ == 0) && capacity_ >= size_;
   }
 
   // Called when *this has been moved from. Conceptually it's a no-op, but we
   // can mutate the state slightly to help subsequent sanity checks catch bugs.
   void OnMovedFrom() {
-#if RTC_DCHECK_IS_ON
+#ifdef NDEBUG
     // Make *this consistent and empty. Shouldn't be necessary, but better safe
     // than sorry.
     size_ = 0;
     capacity_ = 0;
 #else
     // Ensure that *this is always inconsistent, to provoke bugs.
     size_ = 1;
     capacity_ = 0;
 #endif
   }
 
   size_t size_;
   size_t capacity_;
   std::unique_ptr<T[]> data_;
 };
 
 // By far the most common sort of buffer.
 using Buffer = BufferT<uint8_t>;
 
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_BUFFER_H_