Fixed regression caused by 179554 which changed the meaning of ToggleFullscreenMode(). Updated BrowserWindowCocoa::Show() accordingly.

BUG=222605
TEST=(1) Start Chrome and enter fullscreen mode.
(2) Quit and restart.
(3) Verify that Chrome started in fullscreen mode, not presentation mode.

Review URL: https://codereview.chromium.org/149093004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247743 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247743