Delete all log messages depending on system_wrappers.

webrtc/modules/audio_processing/echo_control_mobile_impl.cc

Index: webrtc/modules/audio_processing/echo_control_mobile_impl.cc
diff --git a/webrtc/modules/audio_processing/echo_control_mobile_impl.cc b/webrtc/modules/audio_processing/echo_control_mobile_impl.cc
index a9457d96d9de21ab1712d080f530e7d3e88b0326..51806fa41f4e5a7816d3e66f1d8590536cbd3be3 100644
--- a/webrtc/modules/audio_processing/echo_control_mobile_impl.cc
+++ b/webrtc/modules/audio_processing/echo_control_mobile_impl.cc
@@ -15,7 +15,6 @@
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/modules/audio_processing/aecm/echo_control_mobile.h"
 #include "webrtc/modules/audio_processing/audio_buffer.h"
-#include "webrtc/system_wrappers/include/logging.h"
 
 namespace webrtc {
 
@@ -354,7 +353,6 @@ void EchoControlMobileImpl::Initialize(int sample_rate_hz,
   }
 
   if (stream_properties_->sample_rate_hz > AudioProcessing::kSampleRate16kHz) {
-    LOG(LS_ERROR) << "AECM only supports 16 kHz or lower sample rates";
   }
 
   cancellers_.resize(