Revert "Fix form resubmissions happening silently."

This reverts commit 4c142fe7f51fbfdd20b8551f4759cabb48bbcb82.

This is suspected to have broken
NavigationHistoryTest.testNavigateBackToNoncacheableLoginPage on android.

TBR=abarth
BUG=

Review URL: https://codereview.chromium.org/20840002

git-svn-id: svn://svn.chromium.org/blink/trunk@155023 bbb929c8-8fbe-4397-9dbb-9b2b20218538