Allow calling ::Maximize() a native_app_window_gtk even if it is not resizable.

An API call should always succeed even if it conflicts with another setting on the window.

BUG=277355

Review URL: https://codereview.chromium.org/27661002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230695 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230695