Revert r9378 "Rename APM Config DelayCorrection to ExtendedFilter"

webrtc/modules/audio_processing/aec/aec_core.h

 /*
  *  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 90 matching lines @@
                              int nlp_mode,
                              int metrics_mode,
                              int delay_logging);
 
 // Non-zero enables, zero disables.
 void WebRtcAec_enable_reported_delay(AecCore* self, int enable);
 
 // Returns non-zero if reported delay is enabled and zero if disabled.
 int WebRtcAec_reported_delay_enabled(AecCore* self);
 
-// Enables or disables extended filter mode. Non-zero enables, zero disables.
-void WebRtcAec_enable_extended_filter(AecCore* self, int enable);
+// We now interpret delay correction to mean an extended filter length feature.
+// We reuse the delay correction infrastructure to avoid changes through to
+// libjingle. See details along with |DelayCorrection| in
+// echo_cancellation_impl.h. Non-zero enables, zero disables.
+void WebRtcAec_enable_delay_correction(AecCore* self, int enable);
 
-// Returns non-zero if extended filter mode is enabled and zero if disabled.
-int WebRtcAec_extended_filter_enabled(AecCore* self);
+// Returns non-zero if delay correction is enabled and zero if disabled.
+int WebRtcAec_delay_correction_enabled(AecCore* self);
 
 // Returns the current |system_delay|, i.e., the buffered difference between
 // far-end and near-end.
 int WebRtcAec_system_delay(AecCore* self);
 
 // Sets the |system_delay| to |value|.  Note that if the value is changed
 // improperly, there can be a performance regression.  So it should be used with
 // care.
 void WebRtcAec_SetSystemDelay(AecCore* self, int delay);
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC_AEC_CORE_H_