Revert 48042: it breaks unit-tests and UI tests on ChromeOS

 Disabling app launcher and enabling apps by default on ChromeOS .

BUG=3218
TEST=Open the new tab, the new new tab should be shown. Any installed
     app should be showing in there.

Review URL: http://codereview.chromium.org/2135011

[email protected]
Review URL: http://codereview.chromium.org/2077020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@48044 0039d316-1c4b-4281-b951-d872f2087c98
14 files changed