chromium: add support for x86-64

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com>
Signed-off-by: Eric Bénard <eric@eukrea.com>
chromium: fix DEPENDS

remove gtk+-native from the dependencies (there's no need for
the native gtk) and add gtk+ instead (this one is needed).

From: Laurentiu Palcu <laurentiu.palcu@intel.com>
Signed-off-by: Eric Bénard <eric@eukrea.com>