Cleanup: Remove basictypes.h includes from seccomp-bpf.

Tested on Linux with the following command lines:

$ rm -rf out/
$ ./build/gyp_chromium
$ ninja -C out/Debug sandbox_linux_unittests
$ out/Debug/sandbox_linux_unittests

BUG=138542
TEST=see above
R=mdempsky@chromium.org,jln@chromium.org

Review URL: https://codereview.chromium.org/1066523002

Cr-Commit-Position: refs/heads/master@{#323914}

sandbox/linux/seccomp-bpf/syscall.cc

@@ -6,8 +6,8 @@
 
 #include <asm/unistd.h>
 #include <errno.h>
+#include <stdint.h>
 
-#include "base/basictypes.h"
 #include "base/logging.h"
 #include "sandbox/linux/bpf_dsl/seccomp_macros.h"
 

sandbox/linux/seccomp-bpf/syscall_unittest.cc

@@ -13,7 +13,6 @@
 
 #include <vector>
 
-#include "base/basictypes.h"
 #include "base/posix/eintr_wrapper.h"
 #include "build/build_config.h"
 #include "sandbox/linux/bpf_dsl/bpf_dsl.h"