DevTools: NetworkPanel: do not consume "Esc" keypress unconditionally.
DevTools: NetworkPanel: do not consume "Esc" keypress unconditionally.

NetworkPanel closes details view on "Esc".
But when there is no details view, it doesn't toggle drawer.

With this patch NetworkPanel will toggle drawer in case there is no details view.

BUG=

Review URL: https://codereview.chromium.org/791553006

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@186851 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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