Only write the image when writeImage is called.  We don't write the other formats because when pasting, we want to make sure the image has priority.
Only write the image when writeImage is called.  We don't write the
other formats because when pasting, we want to make sure the image
has priority.

This method appears to only be called from the image context menu
and when viewing an image only in a tab and using copy (ctrl+c or from
the page menu).  In both of these cases, if the user wants the URL,
they can use the context menu "copy image url" to get the URL.

BUG=21593

Review URL: http://codereview.chromium.org/254006

git-svn-id: http://src.chromium.org/svn/trunk/src@27439 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 886291e69bf369802bfafd5781ff4c55d9a5d1ae
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser