Revert of bugging for ipc related crash.

ipc/ipc_channel_common.cc

Index: ipc/ipc_channel_common.cc
diff --git a/ipc/ipc_channel_common.cc b/ipc/ipc_channel_common.cc
index 1a227ad7c5ac052d116e145d6457040792b39ecc..5438c661a301d5f7e467c646618242e5a53aef7b 100644
--- a/ipc/ipc_channel_common.cc
+++ b/ipc/ipc_channel_common.cc
@@ -6,8 +6,6 @@
 
 namespace IPC {
 
-static Channel::MessageVerifier g_message_verifier = nullptr;
-
 // static
 scoped_ptr<Channel> Channel::CreateClient(
     const IPC::ChannelHandle& channel_handle,
@@ -58,16 +56,6 @@ scoped_ptr<Channel> Channel::CreateServer(
 Channel::~Channel() {
 }
 
-// static
-void Channel::SetMessageVerifier(MessageVerifier verifier) {
-  g_message_verifier = verifier;
-}
-
-// static
-Channel::MessageVerifier Channel::GetMessageVerifier() {
-  return g_message_verifier;
-}
-
 bool Channel::IsSendThreadSafe() const {
   return false;
 }