Upgrade old app host to new app launcher on startup

This patch is a continuation of https://codereview.chromium.org/16805002/.

BUG=248825

Review URL: https://chromiumcodereview.appspot.com/17022015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@209604 0039d316-1c4b-4281-b951-d872f2087c98
base::FilePath GetAnyChromePath() {
  base::FilePath chrome_path;
#ifndef OFFICIAL_BUILD
  chrome_path = GetDevelopmentExe(kChromeExe);
#endif
  if (chrome_path.empty())
    chrome_path = GetChromePathForInstallationLevel(SYSTEM_LEVEL_INSTALLATION);
  if (chrome_path.empty())
    chrome_path = GetChromePathForInstallationLevel(USER_LEVEL_INSTALLATION);
  return chrome_path;
}

base::FilePath GetAnyChromePath() {
  base::FilePath chrome_path;
#ifndef OFFICIAL_BUILD
  chrome_path = GetDevelopmentExe(kChromeExe);
#endif
  if (chrome_path.empty())
    chrome_path = GetChromePathForInstallationLevel(SYSTEM_LEVEL_INSTALLATION);
  if (chrome_path.empty())
    chrome_path = GetChromePathForInstallationLevel(USER_LEVEL_INSTALLATION);
  return chrome_path;
}
