Make HighPassFilter not a ProcessingComponent anymore (bit exact).

BUG=webrtc:5298

Review URL: https://codereview.webrtc.org/1490333004

Cr-Commit-Position: refs/heads/master@{#10939}
diff --git a/webrtc/modules/audio_processing/audio_processing_impl.h b/webrtc/modules/audio_processing/audio_processing_impl.h
index 4a290a8..1ca5a8c 100644
--- a/webrtc/modules/audio_processing/audio_processing_impl.h
+++ b/webrtc/modules/audio_processing/audio_processing_impl.h
@@ -193,6 +193,8 @@
       EXCLUSIVE_LOCKS_REQUIRED(crit_render_, crit_capture_);
   void InitializeIntelligibility()
       EXCLUSIVE_LOCKS_REQUIRED(crit_render_, crit_capture_);
+  void InitializeHighPassFilter()
+      EXCLUSIVE_LOCKS_REQUIRED(crit_capture_);
   int InitializeLocked(const ProcessingConfig& config)
       EXCLUSIVE_LOCKS_REQUIRED(crit_render_, crit_capture_);