Remove the small read buffer size for windows; we landed the async IO  handler some time ago, so this is unnecessary.
Remove the small read buffer size for windows; we landed the async IO 
handler some time ago, so this is unnecessary.

I've verified there is no performance difference between these two sizes.

BUG=none
TEST=existing

Review URL: http://codereview.chromium.org/3305014

git-svn-id: http://src.chromium.org/svn/trunk/src@58704 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 1407527ef2366e9ced7942e8785107e64c23c62e
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