Fix path to mock_agc.h

TBR=pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/38399004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7924 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/modules.gyp b/webrtc/modules/modules.gyp
index dd36b67..d1af265 100644
--- a/webrtc/modules/modules.gyp
+++ b/webrtc/modules/modules.gyp
@@ -170,7 +170,7 @@
             'audio_processing/agc/circular_buffer_unittest.cc',
             'audio_processing/agc/gmm_unittest.cc',
             'audio_processing/agc/histogram_unittest.cc',
-            'audio_processing/agc/include/mock_agc.h',
+            'audio_processing/agc/mock_agc.h',
             'audio_processing/agc/pitch_based_vad_unittest.cc',
             'audio_processing/agc/pitch_internal_unittest.cc',
             'audio_processing/agc/pole_zero_filter_unittest.cc',