Own the GLib poll FD; it should not be on the stack.

base/message_pump_glib.cc

Index: base/message_pump_glib.cc
===================================================================
--- base/message_pump_glib.cc	(revision 4621)
+++ base/message_pump_glib.cc	(working copy)
@@ -67,10 +67,11 @@
     flags = 0;
   CHECK(0 == fcntl(read_fd_work_scheduled_, F_SETFL, flags | O_NONBLOCK)) <<
       "Could not set file descriptor to non-blocking!";
-  GPollFD poll_fd;
-  poll_fd.fd = read_fd_work_scheduled_;
-  poll_fd.events = G_IO_IN | G_IO_HUP | G_IO_ERR;
-  work_source_ = AddSource(&WorkSourceFuncs, G_PRIORITY_DEFAULT, &poll_fd);
+  work_source_poll_info_ = new GPollFD;
+  work_source_poll_info_->fd = read_fd_work_scheduled_;
+  work_source_poll_info_->events = G_IO_IN | G_IO_HUP | G_IO_ERR;
+  work_source_ = AddSource(&WorkSourceFuncs, G_PRIORITY_DEFAULT,
+                           work_source_poll_info_);
 }
 
 MessagePumpForUI::~MessagePumpForUI() {
@@ -78,6 +79,7 @@
   close(write_fd_work_scheduled_);
   g_source_destroy(work_source_);
   g_source_unref(work_source_);
+  delete work_source_poll_info_;
 }
 
 struct ThreadIdTraits {