Add support for the "uploadrequired" attribute for Autofill query responses

BUG=84693
TEST=unit_tests --gtest_filter=AutofillDownloadTest.QueryAndUploadTest

Review URL: http://codereview.chromium.org/6969090

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@87729 0039d316-1c4b-4281-b951-d872f2087c98
bool AutofillManager::IsAutofillEnabled() const {
  return const_cast<AutofillManager*>(this)->tab_contents()->profile()->
      GetPrefs()->GetBoolean(prefs::kAutofillEnabled);
}

bool AutofillManager::IsAutofillEnabled() const {
  return const_cast<AutofillManager*>(this)->tab_contents()->profile()->
      GetPrefs()->GetBoolean(prefs::kAutofillEnabled);
}
