DevTools: DevTools opened for an old version of chrome or webview can't record cpu/heap profile.

The reason of that is a difference in URL for TempStorageSharedWorker between the host and the device front-ends
If DevTools window for a host page was opened before DevTools window for a device then the second DevTools
window will fail to run the shared worker and vice versa.

BUG=430794

Review URL: https://codereview.chromium.org/712593002

git-svn-id: svn://svn.chromium.org/blink/trunk@185012 bbb929c8-8fbe-4397-9dbb-9b2b20218538