Implement ScopedFD in terms of ScopedGeneric.

base/process/launch_posix.cc

Index: base/process/launch_posix.cc
diff --git a/base/process/launch_posix.cc b/base/process/launch_posix.cc
index 84a05d61105e9b0cd4980fb66724e09a3887c3ae..79e74d5877dbd5baa856729555ee707925f393b6 100644
--- a/base/process/launch_posix.cc
+++ b/base/process/launch_posix.cc
@@ -26,6 +26,7 @@
 #include "base/debug/stack_trace.h"
 #include "base/file_util.h"
 #include "base/files/dir_reader_posix.h"
+#include "base/files/scoped_file.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/posix/eintr_wrapper.h"
@@ -332,14 +333,13 @@ bool LaunchProcess(const std::vector<std::string>& argv,
     // If a child process uses the readline library, the process block forever.
     // In BSD like OSes including OS X it is safe to assign /dev/null as stdin.
     // See http://crbug.com/56596.
-    int null_fd = HANDLE_EINTR(open("/dev/null", O_RDONLY));
-    if (null_fd < 0) {
+    base::ScopedFD null_fd(HANDLE_EINTR(open("/dev/null", O_RDONLY)));
+    if (!null_fd.is_valid()) {
       RAW_LOG(ERROR, "Failed to open /dev/null");
       _exit(127);
     }
 
-    file_util::ScopedFD null_fd_closer(&null_fd);
-    int new_fd = HANDLE_EINTR(dup2(null_fd, STDIN_FILENO));
+    int new_fd = HANDLE_EINTR(dup2(null_fd.get(), STDIN_FILENO));
     if (new_fd != STDIN_FILENO) {
       RAW_LOG(ERROR, "Failed to dup /dev/null for stdin");
       _exit(127);