Unregister for notifications in BrowserOptionsHandler and ManageProfileHandler before they are destroyed.

BUG=308113,262187

Review URL: https://codereview.chromium.org/26969006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229144 0039d316-1c4b-4281-b951-d872f2087c98
Files.app: Fix the buttom margin of grid view.

Previously, the button margin of grid view is zero.  But the grid view has
margin between its items and we should set the same margin as button margin.
This CL adds a button margin to the grid view.

BUG=308044
TEST=manually

Review URL: https://codereview.chromium.org/27470005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229145 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229145