ChromeOS: Create new tab after fullscreen is really canceled when search key is pressed.   ToggleFullscreenMode is asynchronous, so we need to wait for   next event cycle before creating new tab and set focus to omni box.
ChromeOS: Create new tab after fullscreen is really canceled when search key is pressed.
  ToggleFullscreenMode is asynchronous, so we need to wait for
  next event cycle before creating new tab and set focus to omni box.

BUG=chromium-os:6591
TEST=manual: open non NTP page, go into fullscreen  then hit search key. Result: omnibox should have focus.

Review URL: http://codereview.chromium.org/3956004

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@63532 0039d316-1c4b-4281-b951-d872f2087c98

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