Fix the sandbox to actually allow __NR_sched_getaffinity under ASan.

content/common/sandbox_seccomp_bpf_linux.cc

Index: content/common/sandbox_seccomp_bpf_linux.cc
===================================================================
--- content/common/sandbox_seccomp_bpf_linux.cc	(revision 170827)
+++ content/common/sandbox_seccomp_bpf_linux.cc	(working copy)
@@ -1237,6 +1237,10 @@
 ErrorCode GpuProcessPolicy_x86_64(int sysno, void *) {
   switch(sysno) {
     case __NR_ioctl:
+#if defined(ADDRESS_SANITIZER)
+    // Allow to call sched_getaffinity under AddressSanitizer.
+    case __NR_sched_getaffinity:
+#endif
       return ErrorCode(ErrorCode::ERR_ALLOWED);
     case __NR_open:
       // Accelerated video decode is enabled by default only on Chrome OS.
@@ -1253,10 +1257,6 @@
         // The hook needs dup(), lseek(), and close() to be allowed.
         return Sandbox::Trap(GpuOpenSIGSYS_Handler, NULL);
       }
-#if defined(ADDRESS_SANITIZER)
-    // Allow to call sched_getaffinity under AddressSanitizer.
-    case __NR_sched_getaffinity:
-#endif
     default:
       if (IsEventFd(sysno))
         return ErrorCode(ErrorCode::ERR_ALLOWED);