Update from https://crrev.com/312398

base/process/process_posix.cc

Index: base/process/process_posix.cc
diff --git a/base/process/process_posix.cc b/base/process/process_posix.cc
index 58852bc388c5053f618d86aa01900c0cab771d99..93dec98a0f705e15a82fb6c17a95391785788800 100644
--- a/base/process/process_posix.cc
+++ b/base/process/process_posix.cc
@@ -38,6 +38,16 @@ Process Process::Current() {
 }
 
 // static
+Process Process::OpenWithExtraPriviles(ProcessId pid) {
+  if (pid == GetCurrentProcId())
+    return Current();
+
+  // On POSIX process handles are the same as PIDs, and there are no privileges
+  // to set.
+  return Process(pid);
+}
+
+// static
 Process Process::DeprecatedGetProcessFromHandle(ProcessHandle handle) {
   DCHECK_NE(handle, GetCurrentProcessHandle());
   return Process(handle);