Remove runtime NEON detection

webrtc/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 # TODO(kjellander): Rebase this to webrtc/build/common.gypi changes after r6330.
 
@@ skipping 114 matching lines @@
     defines += [ "WEBRTC_ARCH_ARM64" ]
     defines += [ "WEBRTC_HAS_NEON" ]
   }
 
   if (current_cpu == "arm") {
     defines += [ "WEBRTC_ARCH_ARM" ]
     if (arm_version >= 7) {
       defines += [ "WEBRTC_ARCH_ARM_V7" ]
       if (arm_use_neon) {
         defines += [ "WEBRTC_HAS_NEON" ]
-      } else if (arm_optionally_use_neon) {
-        defines += [ "WEBRTC_DETECT_NEON" ]
       }
     }
   }
 
   if (current_cpu == "mipsel") {
     defines += [ "MIPS32_LE" ]
     if (mips_float_abi == "hard") {
       defines += [ "MIPS_FPU_LE" ]
     }
     if (mips_arch_variant == "r2") {
@@ skipping 137 matching lines @@
 if (use_libfuzzer || use_drfuzz) {
   # This target is only here for gn to discover fuzzer build targets under
   # webrtc/test/fuzzers/.
   group("webrtc_fuzzers_dummy") {
     testonly = true
     deps = [
       "test/fuzzers:webrtc_fuzzer_main",
     ]
   }
 }