Linux sandbox: better APIs with /proc/ arguments

sandbox/linux/services/proc_util.h

Index: sandbox/linux/services/proc_util.h
diff --git a/sandbox/linux/services/proc_util.h b/sandbox/linux/services/proc_util.h
index 74388f8036c61e235e297b2e22473892d3b18d4c..bc14c5ef2ae6ed6af416f0b5fb6bf6d5d51062a5 100644
--- a/sandbox/linux/services/proc_util.h
+++ b/sandbox/linux/services/proc_util.h
@@ -15,7 +15,7 @@ class SANDBOX_EXPORT ProcUtil {
  public:
   // Returns the number of file descriptors in the current process's FD
   // table, excluding |proc_fd|, which should be a file descriptor for
-  // /proc.
+  // /proc/.
   static int CountOpenFds(int proc_fd);
 
   // Checks whether the current process has any directory file descriptor open.
@@ -24,16 +24,14 @@ class SANDBOX_EXPORT ProcUtil {
   // DropFileSystemAccess().
   // Sometimes it's useful to call HasOpenDirectory() after file system access
   // has been dropped. In this case, |proc_fd| should be a file descriptor to
-  // /proc. The file descriptor in |proc_fd| will be ignored by
+  // /proc/. The file descriptor in |proc_fd| will be ignored by
   // HasOpenDirectory() and remains owned by the caller. It is very important
   // for the caller to close it.
-  // If /proc is available, |proc_fd| can be passed as -1.
-  // If |proc_fd| is -1 and /proc is not available, this function will return
-  // false.
-  static bool HasOpenDirectory(int proc_fd);
+  static bool HasOpenDirectory(int proc_fd) WARN_UNUSED_RESULT;
+  static bool HasOpenDirectory() WARN_UNUSED_RESULT;
 
-  // Open /proc/self/task/ or crash if it cannot.
-  static base::ScopedFD OpenProcSelfTask();
+  // Open /proc/ or crash if not possible.
+  static base::ScopedFD OpenProc();
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(ProcUtil);