POSIX: don't allocate memory after forking.

base/file_descriptor_shuffle.h

Index: base/file_descriptor_shuffle.h
diff --git a/base/file_descriptor_shuffle.h b/base/file_descriptor_shuffle.h
index e0cb88b8552b39dac9abe1bd86b178e3690b07de..e1c93cd3d45e2bc4ccb95e13a8dcb74547a001d6 100644
--- a/base/file_descriptor_shuffle.h
+++ b/base/file_descriptor_shuffle.h
@@ -69,9 +69,13 @@ typedef std::vector<InjectionArc> InjectiveMultimap;
 bool PerformInjectiveMultimap(const InjectiveMultimap& map,
                               InjectionDelegate* delegate);
 
-static inline bool ShuffleFileDescriptors(const InjectiveMultimap& map) {
+bool PerformInjectiveMultimapDestructive(InjectiveMultimap* map,
+                                         InjectionDelegate* delegate);
+
+// This function will not call malloc but will mutate |map|
+static inline bool ShuffleFileDescriptors(InjectiveMultimap* map) {
   FileDescriptorTableInjection delegate;
-  return PerformInjectiveMultimap(map, &delegate);
+  return PerformInjectiveMultimapDestructive(map, &delegate);
 }
 
 }  // namespace base