Bug 1314466 - part 3, Fennec child processes are no longer forked so kill and waitpid do not work as expected and must gracefully handle error cases. r=billm

ipc/chromium/src/base/process_util_posix.cc

@@ -70,6 +70,11 @@ ProcessId GetProcId(ProcessHandle process) {
 bool KillProcess(ProcessHandle process_id, int exit_code, bool wait) {
   bool result = kill(process_id, SIGTERM) == 0;
 
+  if (!result && (errno == ESRCH)) {
+    result = true;
+    wait = false;
+  }
+
   if (result && wait) {
     int tries = 60;
     bool exited = false;
@@ -79,6 +84,9 @@ bool KillProcess(ProcessHandle process_id, int exit_code, bool wait) {
       if (pid == process_id) {
         exited = true;
         break;
+      } else if (errno == ECHILD) {
+        exited = true;
+        break;
       }
 
       sleep(1);