DevTools: Make Ctrl+Tilde a shortcut to open the console.

Drive-by: Replace older experiment for using Ctrl+Tilde with a new one,
that does not open drawer on Esc.

R=pfeldman

Review URL: https://codereview.chromium.org/112743002

git-svn-id: svn://svn.chromium.org/blink/trunk@163709 bbb929c8-8fbe-4397-9dbb-9b2b20218538