[DevTools] Console view should hide the suggestion box upon console clear (Ctrl/Cmd+L).
[DevTools] Console view should hide the suggestion box upon console clear (Ctrl/Cmd+L).

This CL hides the suggestion box shown on the console prompt. When the developer has typed a character on the
prompt (the prompt is somewhere down the viewport) and he presses Ctrl/Cmd+L to clear the console, the suggestion
box stays in skewed manner.

R=pfeldman@chromium.org

Review URL: https://codereview.chromium.org/773883003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@186391 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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