Remove deprecated methods from Pickle.

BUG=444578
TEST=none
[email protected]
[email protected]

Committed: https://chromium.googlesource.com/chromium/src/+/b740bfe23ae7ad244356a4a7538b95ae560251db

Review URL: https://codereview.chromium.org/818833004

Cr-Commit-Position: refs/heads/master@{#309691}
diff --git a/ipc/ipc_message.cc b/ipc/ipc_message.cc
index 82b136ac..a6219fe 100644
--- a/ipc/ipc_message.cc
+++ b/ipc/ipc_message.cc
@@ -139,7 +139,7 @@
 
 bool Message::ReadFile(PickleIterator* iter, base::ScopedFD* descriptor) const {
   int descriptor_index;
-  if (!ReadInt(iter, &descriptor_index))
+  if (!iter->ReadInt(&descriptor_index))
     return false;
 
   FileDescriptorSet* file_descriptor_set = file_descriptor_set_.get();