Linux sandbox: better APIs with /proc/ arguments

sandbox/linux/services/thread_helpers.h

Index: sandbox/linux/services/thread_helpers.h
diff --git a/sandbox/linux/services/thread_helpers.h b/sandbox/linux/services/thread_helpers.h
index efc24589224e4989f2b1a4bc0cebc0ae4183c053..2915784f1713c9d005c3bc6dad2f283e69432b5c 100644
--- a/sandbox/linux/services/thread_helpers.h
+++ b/sandbox/linux/services/thread_helpers.h
@@ -14,24 +14,23 @@ namespace sandbox {
 
 class SANDBOX_EXPORT ThreadHelpers {
  public:
-  // Check whether the current process is single threaded. |proc_self_tasks|
-  // must be a file descriptor to /proc/self/task/ and remains owned by the
+  // Check whether the current process is single threaded. |proc_fd|
+  // must be a file descriptor to /proc/ and remains owned by the
   // caller.
-  static bool IsSingleThreaded(int proc_self_task);
+  static bool IsSingleThreaded(int proc_fd);
   static bool IsSingleThreaded();
 
   // Crash if the current process is not single threaded. This will wait
   // on /proc to be updated. In the case where this doesn't crash, this will
   // return promptly. In the case where this does crash, this will first wait
   // for a few ms in Debug mode, a few seconds in Release mode.
-  static void AssertSingleThreaded(int proc_self_task);
+  static void AssertSingleThreaded(int proc_fd);
   static void AssertSingleThreaded();
 
   // Stop |thread| and ensure that it does not have an entry in
   // /proc/self/task/ from the point of view of the current thread. This is
   // the way to stop threads before calling IsSingleThreaded().
-  static bool StopThreadAndWatchProcFS(int proc_self_task,
-                                       base::Thread* thread);
+  static bool StopThreadAndWatchProcFS(int proc_fd, base::Thread* thread);
 
   static const char* GetAssertSingleThreadedErrorMessageForTests();