Backtrace from gdb:

#0  proximity_auth::ProximityAuthWebUIHandler::ExternalDeviceInfoToDictionary(cryptauth::ExternalDeviceInfo const&) ()
    at /usr/local/google/home/hansberry/chromium/.cros_cache/chrome-sdk/tarballs/veyron_minnie+9649.0.0+target_toolchain/usr/bin/../lib/gcc/armv7a-cros-linux-gnueabi/4.9.x/include/g++-v4/bits/basic_string.h:293

#1  0x3a48842a in proximity_auth::ProximityAuthWebUIHandler::GetRemoteDevicesList() () at ../../components/proximity_auth/webui/proximity_auth_webui_handler.cc:471

#2  0x3a4873ca in proximity_auth::ProximityAuthWebUIHandler::GetLocalState(base::ListValue const*) () at ../../components/proximity_auth/webui/proximity_auth_webui_handler.cc:422

#3  0x37ae87c0 in content::WebUIImpl::ProcessWebUIMessage(GURL const&, std::string const&, base::ListValue const&) () at ../../base/callback.h:80
#4  0x37ae7c56 in bool IPC::MessageT<ViewHostMsg_WebUISend_Meta, std::tuple<GURL, std::string, base::ListValue>, void>::Dispatch<content::WebUIImpl, content::WebUIImpl, void, void (content::WebUIImpl::*)(GURL const&, std::string const&, base::ListValue const&)>(IPC::Message const*, content::WebUIImpl*, content::WebUIImpl*, void*, void (content::WebUIImpl::*)(GURL const&, std::string const&, base::ListValue const&)) () at ../../base/tuple.h:77
#5  0x37ae7b3e in content::WebUIImpl::OnMessageReceived(IPC::Message const&) () at ../../content/browser/webui/web_ui_impl.cc:98
#6  0x37ac73ea in content::WebContentsImpl::OnMessageReceived(content::RenderViewHostImpl*, IPC::Message const&) () at ../../content/browser/web_contents/web_contents_impl.cc:752
#7  0x37a25412 in content::RenderViewHostImpl::OnMessageReceived(IPC::Message const&) () at ../../content/browser/renderer_host/render_view_host_impl.cc:713
#8  0x37a28814 in content::RenderWidgetHostImpl::OnMessageReceived(IPC::Message const&) () at ../../content/browser/renderer_host/render_widget_host_impl.cc:543
#9  0x37a1b410 in content::RenderProcessHostImpl::OnMessageReceived(IPC::Message const&) () at ../../content/browser/renderer_host/render_process_host_impl.cc:2493
#10 0x391f4174 in IPC::ChannelProxy::Context::OnDispatchMessage(IPC::Message const&) () at ../../ipc/ipc_channel_proxy.cc:329
#11 0x389d5f70 in base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*) () at ../../base/callback.h:91
#12 0x38979b40 in base::MessageLoop::RunTask(base::PendingTask*) () at ../../base/message_loop/message_loop.cc:422
#13 0x38979e1c in base::MessageLoop::DeferOrRunPendingTask(base::PendingTask) () at ../../base/message_loop/message_loop.cc:433
#14 0x3897a0c0 in base::MessageLoop::DoWork() () at ../../base/message_loop/message_loop.cc:540
#15 0x3897b3f8 in base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) () at ../../base/message_loop/message_pump_libevent.cc:219
#16 0x38994458 in base::RunLoop::Run() () at ../../base/run_loop.cc:111
#17 0x386db7ea in ChromeBrowserMainParts::MainMessageLoopRun(int*) () at ../../chrome/browser/chrome_browser_main.cc:1950
#18 0x378342f0 in content::BrowserMainLoop::RunMainMessageLoopParts() () at ../../content/browser/browser_main_loop.cc:1145
#19 0x3783618c in content::BrowserMainRunnerImpl::Run() () at ../../content/browser/browser_main_runner.cc:142
#20 0x37830c52 in content::BrowserMain(content::MainFunctionParams const&) () at ../../content/browser/browser_main.cc:46
#21 0x386b98c0 in content::ContentMainRunnerImpl::Run() () at ../../content/app/content_main_runner.cc:704
#22 0x386d3490 in service_manager::Main(service_manager::MainParams const&) () at ../../services/service_manager/embedder/main.cc:469
#23 0x386b8c0c in content::ContentMain(content::ContentMainParams const&) () at ../../content/app/content_main.cc:19
#24 0x3745a0de in ChromeMain () at ../../chrome/app/chrome_main.cc:125
#25 0xaae7d8b8 in __libc_start_main (main=0x0, argc=-1096715384, argv=0x0, init=<optimized out>, fini=0x3be81f8d <__libc_csu_fini>, rtld_fini=0xab4f4f41 <_dl_fini>, stack_end=0xbea174e4) at libc-start.c:289
#26 0x37459f80 in _start ()