Fix crasher with autofill infobar.
The "save credit card" information was deleted by the AutofillManager when the form is submitted but was still pointed to by the TabContents, causing a crasher when navigating.

BUG=50428
TEST=See steps in 56238.

Review URL: http://codereview.chromium.org/3466006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@60095 0039d316-1c4b-4281-b951-d872f2087c98
void TranslateManager::RequestTranslateScript() {
  if (translate_script_request_pending_)
    return;

  translate_script_request_pending_ = true;
  URLFetcher* fetcher = URLFetcher::Create(0, GURL(kTranslateScriptURL),
                                           URLFetcher::GET, this);
  fetcher->set_request_context(Profile::GetDefaultRequestContext());
  fetcher->set_extra_request_headers(kTranslateScriptHeader);
  fetcher->Start();
}

void TranslateManager::RequestTranslateScript() {
  if (translate_script_request_pending_)
    return;

  translate_script_request_pending_ = true;
  URLFetcher* fetcher = URLFetcher::Create(0, GURL(kTranslateScriptURL),
                                           URLFetcher::GET, this);
  fetcher->set_request_context(Profile::GetDefaultRequestContext());
  fetcher->set_extra_request_headers(kTranslateScriptHeader);
  fetcher->Start();
}
