Cleanup: Mark a function as x86-64 / ARM only. Found by clang.

Review URL: https://codereview.chromium.org/255993002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266460 0039d316-1c4b-4281-b951-d872f2087c98

components/nacl/loader/nonsfi/nonsfi_sandbox.cc

@@ -139,6 +139,7 @@ ErrorCode RestrictMmap(SandboxBPF* sb) {
                   ErrorCode(ErrorCode::ERR_ALLOWED)));
 }
 
+#if defined(__x86_64__) || defined(__arm__)
 ErrorCode RestrictSocketpair(SandboxBPF* sb) {
   // Only allow AF_UNIX, PF_UNIX. Crash if anything else is seen.
   COMPILE_ASSERT(AF_UNIX == PF_UNIX, af_unix_pf_unix_different);
@@ -147,6 +148,7 @@ ErrorCode RestrictSocketpair(SandboxBPF* sb) {
                   ErrorCode(ErrorCode::ERR_ALLOWED),
          sb->Trap(sandbox::CrashSIGSYS_Handler, NULL));
 }
+#endif
 
 bool IsGracefullyDenied(int sysno) {
   switch (sysno) {