Change include path and names to compile with new webrtc.

* external/webrtc is upgraded and some header files are
  moved from interface to include directories.
* Some external/webrtc data member variables are renamed.

Change-Id: I2d6d4b62dd18f921b0360d524651ebdf7bd2fffc
diff --git a/media/libeffects/preprocessing/Android.mk b/media/libeffects/preprocessing/Android.mk
index ea3c59d..0022fd9 100644
--- a/media/libeffects/preprocessing/Android.mk
+++ b/media/libeffects/preprocessing/Android.mk
@@ -13,7 +13,7 @@
 LOCAL_C_INCLUDES += \
     external/webrtc/src \
     external/webrtc/src/modules/interface \
-    external/webrtc/src/modules/audio_processing/interface \
+    external/webrtc/src/modules/audio_processing/include \
     $(call include-path-for, audio-effects)
 
 LOCAL_C_INCLUDES += $(call include-path-for, speex)