Prepare chrome to use the new Mojo EDK by default.

base/message_loop/message_loop.cc

Index: base/message_loop/message_loop.cc
diff --git a/base/message_loop/message_loop.cc b/base/message_loop/message_loop.cc
index a0c5f61f598dec8f78ed9645e8fef5171ab6b85c..b5e9c6599403033d144407e7fc05d1208fd97065 100644
--- a/base/message_loop/message_loop.cc
+++ b/base/message_loop/message_loop.cc
@@ -300,7 +300,12 @@ void MessageLoop::QuitWhenIdle() {
   if (run_loop_) {
     run_loop_->quit_when_idle_received_ = true;
   } else {
-    NOTREACHED() << "Must be inside Run to call Quit";
+    // We don't assert that run_loop_ is valid for custom message pumps. Some,
+    // for example MojoMessagePump, might have shutdown already based on other
+    // shutdown signals.
+    if (type_ != MessageLoop::TYPE_CUSTOM) {
+      NOTREACHED() << "Must be inside Run to call Quit";
+    }
   }
 }