net: Allow IO when UpdateData closes its FileStream.
net: Allow IO when UpdateData closes its FileStream.


BUG=72001
TEST=http://codereview.chromium.org/8952017 no longer crashes after restoring a page which is a result of POSTing a file.

Review URL: http://codereview.chromium.org/9347021

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@121004 0039d316-1c4b-4281-b951-d872f2087c98

gavinp/chromium,ropik/chromium,ropik/chromium,yitian134/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,yitian134/chromium,ropik/chromium,adobe/chromium,gavinp/chromium,adobe/chromium,gavinp/chromium,yitian134/chromium,gavinp/chromium,ropik/chromium,yitian134/chromium,gavinp/chromium,gavinp/chromium,yitian134/chromium,yitian134/chromium,yitian134/chromium,ropik/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,ropik/chromium,gavinp/chromium,adobe/chromium,adobe/chromium,gavinp/chromium,ropik/chromium,ropik/chromium,gavinp/chromium,ropik/chromium,adobe/chromium,gavinp/chromium