AutoFill: Record whether the user initiated the form submission and don't save form data if the form was not user-submitted.

BUG=48225
TEST=none

Review URL: http://codereview.chromium.org/2842062

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@53350 0039d316-1c4b-4281-b951-d872f2087c98
AutoFillManager::AutoFillManager(TabContents* tab_contents,
                                 PersonalDataManager* personal_data)
    : tab_contents_(tab_contents),
      personal_data_(personal_data),
      download_manager_(NULL) {
  DCHECK(tab_contents);
}

AutoFillManager::AutoFillManager(TabContents* tab_contents,
                                 PersonalDataManager* personal_data)
    : tab_contents_(tab_contents),
      personal_data_(personal_data),
      download_manager_(NULL) {
  DCHECK(tab_contents);
}
