Revert of ipc: Clean up interface of attachment broker. (patchset #5 id:80001 of https://codereview.chromium.org/1269553003/)

Reason for revert:
Causes failures in:

IPCAttachmentBrokerPrivilegedWinTest.SendHandle
IPCAttachmentBrokerPrivilegedWinTest.SendHandleToSelf
IPCAttachmentBrokerPrivilegedWinTest.SendHandleWithoutPermissions

on the Win7 Tests (dbg)(1) bot

http://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20%28dbg%29%281%29/builds/40372/steps/ipc_tests/logs/stdio

Original issue's description:
> ipc: Clean up interface of attachment broker.
>
> AttachmentBrokerUnprivileged now has a method
> DesignateBrokerCommunicationChannel which is used by non-broker processes to
> designate an IPC::Channel as the communication medium for brokerable attachment
> messages. IPC::Channel has a new member attachment_broker_endpoint_ which causes
> it to pass all messages through the attachment broker before forwarding them to
> the listener.
>
> BUG=493414
>
> Committed: https://crrev.com/9a06836982214f2edced21bbd1615b49e7f231bf
> Cr-Commit-Position: refs/heads/master@{#341143}

TBR=tsepez@chromium.org,erikchen@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=493414

Review URL: https://codereview.chromium.org/1259953005

Cr-Commit-Position: refs/heads/master@{#341171}

1 files changed, 0 insertions, 12 deletions

diff --git a/ipc/ipc_channel.h b/ipc/ipc_channel.h
index a9f70b2..c5c46a7 100644
--- a/ipc/ipc_channel.h
+++ b/ipc/ipc_channel.h
@@ -165,7 +165,6 @@ class IPC_EXPORT Channel : public Sender {
       Listener* listener,
       AttachmentBroker* broker = nullptr);
 
-  Channel() : attachment_broker_endpoint_(false) {}
   ~Channel() override;
 
   // Connect the pipe.  On the server side, this will initiate
@@ -253,17 +252,6 @@ class IPC_EXPORT Channel : public Sender {
   static void NotifyProcessForkedForTesting();
 #endif
 
-  void set_attachment_broker_endpoint(bool is_endpoint) {
-    attachment_broker_endpoint_ = is_endpoint;
-  }
-
- protected:
-  bool is_attachment_broker_endpoint() { return attachment_broker_endpoint_; }
-
- private:
-  // Whether this channel is used as an endpoint for sending and receiving
-  // brokerable attachment messages to/from the broker process.
-  bool attachment_broker_endpoint_;
 };
 
 #if defined(OS_POSIX)