Moving FFT on farend signal to where it is used in AEC (bit exact).

webrtc/modules/audio_processing/aec/aec_core_internal.h

Index: webrtc/modules/audio_processing/aec/aec_core_internal.h
diff --git a/webrtc/modules/audio_processing/aec/aec_core_internal.h b/webrtc/modules/audio_processing/aec/aec_core_internal.h
index f8cb799ef4a99934a6c87e236ae2ce124b4447e3..c9040effcde02404b2d2a03bbf05a6ac1a768310 100644
--- a/webrtc/modules/audio_processing/aec/aec_core_internal.h
+++ b/webrtc/modules/audio_processing/aec/aec_core_internal.h
@@ -95,8 +95,8 @@ struct AecCore {
 
   int xfBufBlockPos;
 
-  RingBuffer* far_buf;
-  RingBuffer* far_buf_windowed;
+  RingBuffer* far_time_buf;
+
   int system_delay;  // Current system delay buffered in AEC.
 
   int mult;  // sampling frequency multiple
@@ -165,7 +165,6 @@ struct AecCore {
   // each time.
   int debug_dump_count;
 
-  RingBuffer* far_time_buf;
   rtc_WavWriter* farFile;
   rtc_WavWriter* nearFile;
   rtc_WavWriter* outFile;