Replace RTC_DCHECK(false) with RTC_NOTREACHED().

webrtc/modules/audio_processing/echo_control_mobile_impl.cc

 /*
  *  Copyright (c) 2012 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 15 matching lines @@
       return 0;
     case EchoControlMobile::kEarpiece:
       return 1;
     case EchoControlMobile::kLoudEarpiece:
       return 2;
     case EchoControlMobile::kSpeakerphone:
       return 3;
     case EchoControlMobile::kLoudSpeakerphone:
       return 4;
   }
-  RTC_DCHECK(false);
+  RTC_NOTREACHED();
   return -1;
 }
 
 AudioProcessing::Error MapError(int err) {
   switch (err) {
     case AECM_UNSUPPORTED_FUNCTION_ERROR:
       return AudioProcessing::kUnsupportedFunctionError;
     case AECM_NULL_POINTER_ERROR:
       return AudioProcessing::kNullPointerError;
     case AECM_BAD_PARAMETER_ERROR:
@@ skipping 335 matching lines @@
   for (auto& canceller : cancellers_) {
     int handle_error = WebRtcAecm_set_config(canceller->state(), config);
     if (handle_error != AudioProcessing::kNoError) {
       error = handle_error;
     }
   }
   return error;
 }
 
 }  // namespace webrtc