Couple of small AppCache update job mods
Couple of small AppCache update job mods

1) Fix a bug with failing to deliver the ERROR event in some cases.

2) Use a larger IO buffer to improve download performance.

BUG=none
TEST=manual

Review URL: http://codereview.chromium.org/596078

git-svn-id: http://src.chromium.org/svn/trunk/src@38913 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 8eeffa009b246ce37d01524d7407527acea150f9
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