[Sync] Cleanup all tab sync enabling logic now that its on by default.

BUG=none
TEST=


Review URL: https://chromiumcodereview.appspot.com/10443046

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@139462 0039d316-1c4b-4281-b951-d872f2087c98
void SyncTest::TriggerAuthError() {
  ASSERT_TRUE(ServerSupportsErrorTriggering());
  std::string path = "chromiumsync/cred";
  ui_test_utils::NavigateToURL(browser(), sync_server_.GetURL(path));
}

void SyncTest::TriggerAuthError() {
  ASSERT_TRUE(ServerSupportsErrorTriggering());
  std::string path = "chromiumsync/cred";
  ui_test_utils::NavigateToURL(browser(), sync_server_.GetURL(path));
}
