Stop using SHFileOperation from the disk cache code.
Stop using SHFileOperation from the disk cache code.

Using SHFileOperation to delete old cache files has the disadvantage that once in a while
somebody decides to perform COM operations assuming STA, and that doesn't work with the
worker pool.

BUG=1314744


git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@590 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