Http cache: Delete the response headers when the network transaction is re-created, and make sure that truncated_ is also creared.
Http cache: Delete the response headers when the network transaction
is re-created, and make sure that truncated_ is also creared.

This is a tentative fix for some crashes from the reliability bot.

BUG=28850
TEST=none
TBR=eroman

Review URL: http://codereview.chromium.org/444020

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@33251 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