upgrade cache tool: Improve the handling of errors so that we ignore as much as possible without aborting the whole process.
upgrade cache tool: Improve the handling of errors so that
we ignore as much as possible without aborting the whole process.

R=nsylvain

Review URL: http://codereview.chromium.org/12925

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@6334 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