Stop using chrome-sandbox to determine real pids

content/public/common/zygote_fork_delegate_linux.h

Index: content/public/common/zygote_fork_delegate_linux.h
diff --git a/content/public/common/zygote_fork_delegate_linux.h b/content/public/common/zygote_fork_delegate_linux.h
index 39833c5262ec7334f486fef1cfb71b9c273d5157..4f3b43aa39c5293820667b777051dfadacfaddc7 100644
--- a/content/public/common/zygote_fork_delegate_linux.h
+++ b/content/public/common/zygote_fork_delegate_linux.h
@@ -49,18 +49,19 @@ class ZygoteForkDelegate {
   enum {
     // Used to pass in the descriptor for talking to the Browser
     kBrowserFDIndex,
-    // The next two are used in the protocol for discovering the
-    // child processes real PID from within the SUID sandbox. See
-    // http://code.google.com/p/chromium/wiki/LinuxZygote
-    kDummyFDIndex,
+    // Used to pass in the descriptor for talking to the fork parent process.
+    // After forking, the child process is responsible for discovering its own
+    // global process ID and sending it to the parent via this descriptor.
+    // See http://code.google.com/p/chromium/wiki/LinuxZygote
     kParentFDIndex,
     kNumPassedFDs  // Number of FDs in the vector passed to Fork().
   };
 
   // Delegate forks, returning a -1 on failure. Outside the
   // suid sandbox, Fork() returns the Linux process ID.
-  // This method is not aware of any potential pid namespaces, so it'll
-  // return a raw pid just like fork() would.
+  // The child process is expected to send its global pid to the parent process
+  // (see kParentFDIndex above), but this function still returns a raw pid just
+  // like fork() would.
   // Delegate is responsible for communicating the channel ID to the
   // newly created child process.
   virtual pid_t Fork(const std::string& process_type,