Revert of IPC: Add attachment brokering support to the message header.

ipc/ipc_channel.cc

Index: ipc/ipc_channel.cc
diff --git a/ipc/ipc_channel.cc b/ipc/ipc_channel.cc
index 89505cb5f76e40ebae0075197c95b3199a0f7fbf..ac09c5ab1ef1d00b31c4f3a2e7b0a260673dbfbe 100644
--- a/ipc/ipc_channel.cc
+++ b/ipc/ipc_channel.cc
@@ -41,26 +41,4 @@
       base::RandInt(0, std::numeric_limits<int32>::max()));
 }
 
-Channel::OutputElement::OutputElement(Message* message)
-    : message_(message), buffer_(nullptr), length_(0) {}
-
-Channel::OutputElement::OutputElement(void* buffer, size_t length)
-    : message_(nullptr), buffer_(buffer), length_(length) {}
-
-Channel::OutputElement::~OutputElement() {
-  free(buffer_);
-}
-
-size_t Channel::OutputElement::size() const {
-  if (message_)
-    return message_->size();
-  return length_;
-}
-
-const void* Channel::OutputElement::data() const {
-  if (message_)
-    return message_->data();
-  return buffer_;
-}
-
 }  // namespace IPC