Roll //build, //native_client, and a few more targets of opportunity.

sandbox/linux/seccomp-bpf/syscall.h

Index: sandbox/linux/seccomp-bpf/syscall.h
diff --git a/sandbox/linux/seccomp-bpf/syscall.h b/sandbox/linux/seccomp-bpf/syscall.h
index dfb44ebdcd780a1ac193187de0ea36cedfd2b02a..ccfc88dcb30e860cdd32d6f6e10e016593ed289e 100644
--- a/sandbox/linux/seccomp-bpf/syscall.h
+++ b/sandbox/linux/seccomp-bpf/syscall.h
@@ -9,13 +9,9 @@
 #include <stdint.h>
 
 #include "base/macros.h"
+#include "sandbox/linux/system_headers/linux_signal.h"
 #include "sandbox/sandbox_export.h"
 
-// Android's signal.h doesn't define ucontext etc.
-#if defined(OS_ANDROID)
-#include "sandbox/linux/system_headers/android_ucontext.h"
-#endif
-
 namespace sandbox {
 
 // This purely static class can be used to perform system calls with some