Revert of Implement ScopedFD in terms of ScopedGeneric.

content/common/sandbox_linux/sandbox_linux.cc

Index: content/common/sandbox_linux/sandbox_linux.cc
diff --git a/content/common/sandbox_linux/sandbox_linux.cc b/content/common/sandbox_linux/sandbox_linux.cc
index 6f605849cbc1e90686172bbc66964baab6109463..5fd89f725c3ec9d1fba28e5e34c4775fcd1cdb25 100644
--- a/content/common/sandbox_linux/sandbox_linux.cc
+++ b/content/common/sandbox_linux/sandbox_linux.cc
@@ -15,7 +15,6 @@
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
-#include "base/files/scoped_file.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
@@ -44,6 +43,10 @@
   }
 };
 
+// Don't use base::ScopedFD since it doesn't CHECK that the file descriptor was
+// closed.
+typedef scoped_ptr<int, FDCloser> SafeScopedFD;
+
 void LogSandboxStarted(const std::string& sandbox_name) {
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   const std::string process_type =
@@ -200,25 +203,25 @@
 // of using the pid.
 bool LinuxSandbox::IsSingleThreaded() const {
   bool is_single_threaded = false;
-  base::ScopedFD proc_self_task(OpenProcTaskFd(proc_fd_));
+  int proc_self_task = OpenProcTaskFd(proc_fd_);
 
 // In Debug mode, it's mandatory to be able to count threads to catch bugs.
 #if !defined(NDEBUG)
   // Using CHECK here since we want to check all the cases where
   // !defined(NDEBUG)
   // gets built.
-  CHECK(proc_self_task.is_valid())
-      << "Could not count threads, the sandbox was not "
-      << "pre-initialized properly.";
+  CHECK_LE(0, proc_self_task) << "Could not count threads, the sandbox was not "
+                              << "pre-initialized properly.";
 #endif  // !defined(NDEBUG)
 
-  if (!proc_self_task.is_valid()) {
+  if (proc_self_task < 0) {
     // Pretend to be monothreaded if it can't be determined (for instance the
     // setuid sandbox is already engaged but no proc_fd_ is available).
     is_single_threaded = true;
   } else {
+    SafeScopedFD task_closer(&proc_self_task);
     is_single_threaded =
-        sandbox::ThreadHelpers::IsSingleThreaded(proc_self_task.get());
+        sandbox::ThreadHelpers::IsSingleThreaded(proc_self_task);
   }
 
   return is_single_threaded;
@@ -388,10 +391,11 @@
 
 void LinuxSandbox::StopThreadAndEnsureNotCounted(base::Thread* thread) const {
   DCHECK(thread);
-  base::ScopedFD proc_self_task(OpenProcTaskFd(proc_fd_));
-  PCHECK(proc_self_task.is_valid());
-  CHECK(sandbox::ThreadHelpers::StopThreadAndWatchProcFS(proc_self_task.get(),
-                                                         thread));
+  int proc_self_task = OpenProcTaskFd(proc_fd_);
+  PCHECK(proc_self_task >= 0);
+  SafeScopedFD task_closer(&proc_self_task);
+  CHECK(
+      sandbox::ThreadHelpers::StopThreadAndWatchProcFS(proc_self_task, thread));
 }
 
 }  // namespace content