Prevent needless vertical margin change.
Prevent needless vertical margin change.

When one change horizontal margin, vertical margin is also changed to
zero.

BUG=chromium-os:8081
TEST=none

Review URL: http://codereview.chromium.org/4151012

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@64550 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser