Don't show download arrow animation for extensions.
Don't show download arrow animation for extensions.

This patch exempts non-theme extensions (extensions not downloaded from theme minigallery) from showing the arrow download animation.

BUG=29632
TEST=Install extension from the gallery. No download arrow should be shown. Install theme from https://tools.google.com/chrome/intl/en/themes/index.html. Download arrow should be shown. Download random other stuff -> download arrow should be shown.

Review URL: http://codereview.chromium.org/504031

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@34921 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