Revert r9378 "Rename APM Config DelayCorrection to ExtendedFilter"

webrtc/modules/audio_processing/aec/aec_core.h

Index: webrtc/modules/audio_processing/aec/aec_core.h
diff --git a/webrtc/modules/audio_processing/aec/aec_core.h b/webrtc/modules/audio_processing/aec/aec_core.h
index aa5687a4f495b821f8f49b41157d5acdc5e1edcd..d9335e322d3cc44f54f10a8eee4cef36b379f94e 100644
--- a/webrtc/modules/audio_processing/aec/aec_core.h
+++ b/webrtc/modules/audio_processing/aec/aec_core.h
@@ -108,11 +108,14 @@ 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);
-
-// Returns non-zero if extended filter mode is enabled and zero if disabled.
-int WebRtcAec_extended_filter_enabled(AecCore* self);
+// 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 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.