Fix base::CPU detection.

base/cpu_unittest.cc

 // Copyright (c) 2011 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.
 
 #include "base/cpu.h"
+#include "build/build_config.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 // Tests whether we can run extended instructions represented by the CPU
 // information. This test actually executes some extended instructions (such as
 // MMX, SSE, etc.) supported by the CPU and sees we can run them without
 // "undefined instruction" exceptions. That is, this test succeeds when this
 // test finishes without a crash.
 TEST(CPU, RunExtendedInstructions) {
 #if defined(ARCH_CPU_X86_FAMILY)
@@ skipping 66 matching lines @@
     __asm__ __volatile__("pmuldq %%xmm0, %%xmm0\n" : : : "xmm0");
   }
 
   if (cpu.has_sse42()) {
     // Execute an SSE 4.2 instruction.
     __asm__ __volatile__("crc32 %%eax, %%eax\n" : : : "eax");
   }
 #endif
 #endif
 }