Revert 157422 "Remove lots of code related synchronously attaching"

Causing ASSERT failures in debug.

> Remove lots of code related synchronously attaching
> 
> Now that we always lazy attach we can remove the hacks and special
> cases related to synchronously attaching.
> 
> BUG=276689
> 
> Review URL: https://chromiumcodereview.appspot.com/23606020
> 
> git-svn-id: svn://svn.chromium.org/blink/trunk@157422 bbb929c8-8fbe-4397-9dbb-9b2b20218538

TBR=esprehn@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23526031

git-svn-id: svn://svn.chromium.org/blink/trunk@157431 bbb929c8-8fbe-4397-9dbb-9b2b20218538