import changes from `dev' branch of rmottola/Arctic-Fox:

- Bug 1262671 - IPC sentinel checking (r=froydnj) (2bd39988fe)
- Bug 1262671 - IPC ReadData/ReadBytes elimination (r=froydnj) (85b47baffd)
- Bug 1272415: Don't include task.h everywhere. r=froydnj (6198aedfed)
- Bug 1273312 - Add task.h to ipdl unit tests (r=khuey) (42b8d3bb90)
- Bug 1268616 - Part 1: Check max message size before resizing. r=billm (6889a43e16)
- Bug 1268616 - Part 2: Stop sending messages that are too large. r=billm (a68e6624be)
- Bug 1268616 - Part 3: Reduce the maxmimum IPC message size. r=billm (581076632e)
- Bug 1262671 - Use BufferList for Pickle (r=froydnj) (f61d8b233d)
- Bug 1262671 - Introduce MFBT BufferList class (r=froydnj) (cb1aca1708)
- mfbt: BufferList: VC2013 fix (93da0d98f7)

ipc/glue/MessageLink.cpp

@@ -9,6 +9,7 @@
 #include "mozilla/ipc/MessageChannel.h"
 #include "mozilla/ipc/BrowserProcessSubThread.h"
 #include "mozilla/ipc/ProtocolUtils.h"
+#include "chrome/common/ipc_channel.h"
 
 #ifdef MOZ_NUWA_PROCESS
 #include "ipc/Nuwa.h"
@@ -157,6 +158,7 @@ ProcessLink::EchoMessage(Message *msg)
 void
 ProcessLink::SendMessage(Message *msg)
 {
+    MOZ_RELEASE_ASSERT(msg->size() < IPC::Channel::kMaximumMessageSize);
     mChan->AssertWorkerThread();
     mChan->mMonitor->AssertCurrentThreadOwns();