Remove runtime CPU detection for SSE optimized media/ methods.

media/base/vector_math_testing.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_BASE_VECTOR_MATH_TESTING_H_
 #define MEDIA_BASE_VECTOR_MATH_TESTING_H_
 
 #include <utility>
 
 #include "build/build_config.h"
 #include "media/base/media_export.h"
 
 namespace media {
 namespace vector_math {
 
 // Optimized versions exposed for testing.  See vector_math.h for details.
 MEDIA_EXPORT void FMAC_C(const float src[], float scale, int len, float dest[]);
 MEDIA_EXPORT void FMUL_C(const float src[], float scale, int len, float dest[]);
 MEDIA_EXPORT std::pair<float, float> EWMAAndMaxPower_C(
     float initial_value, const float src[], int len, float smoothing_factor);
 
-#if defined(ARCH_CPU_X86_FAMILY)
+#if defined(ARCH_CPU_X86_FAMILY) && !defined(OS_NACL)
 MEDIA_EXPORT void FMAC_SSE(const float src[], float scale, int len,
                            float dest[]);
 MEDIA_EXPORT void FMUL_SSE(const float src[], float scale, int len,
                            float dest[]);
 MEDIA_EXPORT std::pair<float, float> EWMAAndMaxPower_SSE(
     float initial_value, const float src[], int len, float smoothing_factor);
 #endif
 
 #if defined(ARCH_CPU_ARM_FAMILY) && defined(USE_NEON)
 MEDIA_EXPORT void FMAC_NEON(const float src[], float scale, int len,
                             float dest[]);
 MEDIA_EXPORT void FMUL_NEON(const float src[], float scale, int len,
                             float dest[]);
 MEDIA_EXPORT std::pair<float, float> EWMAAndMaxPower_NEON(
     float initial_value, const float src[], int len, float smoothing_factor);
 #endif
 
 }  // namespace vector_math
 }  // namespace media
 
 #endif  // MEDIA_BASE_VECTOR_MATH_TESTING_H_