Stops dropping several messages to the RenderView when a RenderViewHost is created for prerendering.  In particular, the ViewMsg_WasHidden message was being dropped, which prevents unneeded paint events, as was ViewMsg_AllowScriptToClose.
Stops dropping several messages to the RenderView when
a RenderViewHost is created for prerendering.  In particular,
the ViewMsg_WasHidden message was being dropped, which
prevents unneeded paint events, as was
ViewMsg_AllowScriptToClose.

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/6820070

git-svn-id: http://src.chromium.org/svn/trunk/src@81418 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: b6007ea0f5f41a5deca3b789d6cfad628451e9bb
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