Google does not officially package a "portable" version in a single EXE, but the community-trusted site PortableApps.com provides a clean, safe wrapper for the official Chrome binaries.
If you want absolute control without a third-party launcher:
Google does provide an official portable version of Chrome. However, Google distributes the standard offline installer for 32-bit Chrome. That offline installer can be combined with portable launchers.
Missing Flash/Java: Portable Chrome follows the same modern standards as the desktop version, meaning legacy plugins like Flash are no longer supported.
If you are in an environment with no internet, you can create a truly offline installer by following these steps: