Remove runtime NEON detection

webrtc/common_audio/fir_filter.cc

Index: webrtc/common_audio/fir_filter.cc
diff --git a/webrtc/common_audio/fir_filter.cc b/webrtc/common_audio/fir_filter.cc
index 13a2237dae1a599f737288d6752eae4cbbfd81d5..ed1f1bbfb81439350a93b08f04dc37ee0d76705d 100644
--- a/webrtc/common_audio/fir_filter.cc
+++ b/webrtc/common_audio/fir_filter.cc
@@ -61,13 +61,6 @@ FIRFilter* FIRFilter::Create(const float* coefficients,
 #elif defined(WEBRTC_HAS_NEON)
   filter =
       new FIRFilterNEON(coefficients, coefficients_length, max_input_length);
-#elif defined(WEBRTC_DETECT_NEON)
-  if (WebRtc_GetCPUFeaturesARM() & kCPUFeatureNEON) {
-    filter =
-        new FIRFilterNEON(coefficients, coefficients_length, max_input_length);
-  } else {
-    filter = new FIRFilterC(coefficients, coefficients_length);
-  }
 #else
   filter = new FIRFilterC(coefficients, coefficients_length);
 #endif