Remove IPC::BrokerableAttachment.

base/pickle.cc

Index: base/pickle.cc
diff --git a/base/pickle.cc b/base/pickle.cc
index cfb316c13e56974abc7ffb98fa7e4693e40a7301..02f39b57b7bb8133ad23501f2eb619117af2c0de 100644
--- a/base/pickle.cc
+++ b/base/pickle.cc
@@ -233,7 +233,6 @@ void PickleSizer::AddBytes(int length) {
 
 void PickleSizer::AddAttachment() {
   // From IPC::Message::WriteAttachment
-  AddBool();
   AddInt();
 }