If you aren't familiar, Chrome has two versions: the open-source Chromium project, and Google's proprietary Chrome builds with added functionality (like a built-in Flash player). Numerous browsers on Android are based on Chromium, including the popular Snapdragon-optimized CAF browser. Unfortunately, Google has now shut off access to the Chrome Sync API on Android for anything but Chrome itself, including vanilla builds of Chromium.

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The report was closed yesterday by a Chrome developer, explaining that access to the Sync API was locked down "to address a security vulnerability." The developer went on to say that Chrome Sync was never officially supported for third party browsers, and that Google does not intend to create a whitelist solution where users/developers can request refresh tokens.

If you're using any browser on Android that syncs with Chrome, you have probably already noticed it stopped working - and cannot be fixed. I do hope Google implements a third-party API (even with limited functionality) in the near future, but I don't have much confidence they will.

Source: Chromium Project (access is limited, mirror here)