Fix compilation issue detected by internal tool.

webrtc/modules/audio_processing/aec3/echo_remover.cc

 /*
  *  Copyright (c) 2017 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.
  */
 #include "webrtc/modules/audio_processing/aec3/echo_remover.h"
@@ skipping 79 matching lines @@
   bool echo_leakage_detected_ = false;
   std::array<float, kBlockSize> x_old_;
   AecState aec_state_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(EchoRemoverImpl);
 };
 
 int EchoRemoverImpl::instance_count_ = 0;
 
 EchoRemoverImpl::EchoRemoverImpl(int sample_rate_hz)
-    : data_dumper_(
+    : fft_(),
+      data_dumper_(
           new ApmDataDumper(rtc::AtomicOps::Increment(&instance_count_))),
       optimization_(DetectOptimization()),
       sample_rate_hz_(sample_rate_hz),
       subtractor_(data_dumper_.get(), optimization_),
       suppression_gain_(optimization_),
       cng_(optimization_),
       suppression_filter_(sample_rate_hz_),
       X_buffer_(optimization_,
                 std::max(subtractor_.MinFarendBufferLength(),
                          power_echo_model_.MinFarendBufferLength()),
@@ skipping 131 matching lines @@
                         aec_state_.SaturatedCapture() ? 1 : 0);
 }
 
 }  // namespace
 
 EchoRemover* EchoRemover::Create(int sample_rate_hz) {
   return new EchoRemoverImpl(sample_rate_hz);
 }
 
 }  // namespace webrtc