android envsetup: Stop setting ORDER_DEFINES.

order_text_section is only used by the chrome_initial target, which isn't
used on android.

(Some internal gyp file explicitly adds -Wl,-section-ordering-file without
going through the order_text_section gyp define, so this setting here is likely
a remnant from when that wasn't the case.)

No intended behavior change.

BUG=330631
NOTRY=true

Review URL: https://codereview.chromium.org/148513002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247283 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247283