GitLab

A Callback decides when it is constructed whether it needs to do a weak pointer
check when called.  Therefore, pass the weak pointer of NetErrorTabHelper to
base::Bind when we create the callback instead of binding it later in
StartDnsProbe.

BUG=174720

Review URL: https://chromiumcodereview.appspot.com/12223080

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182301 0039d316-1c4b-4281-b951-d872f2087c98