Fix darwin build break.

namespace android {

namespace base {

static std::mutex quick_exit_mutex;

static std::vector<void(*)()> quick_exit_handlers;

static auto& quick_exit_mutex = *new std::mutex();

static auto& quick_exit_handlers = *new std::vector<void (*)()>();

void quick_exit(int exit_code) {

  std::lock_guard<std::mutex> lock(quick_exit_mutex);