Basically some library authors realized that AES-256 wasn't really worth the slower speed - especially on older ARM CPU's (which were modern on phones back then) with no real acceleration for AES(-GCM), the performance with AES-256 bit was noticeably worse than with AES-128 - and AES-256 had effectively zero value back then. Similar thing happend in older Firefox versions (e.g this one). Why Google dropped support for that in later versions is beyond me. Strangely enough Android 4.4.x (SSLLabs shows 4.4.2) indeed has TLSv1.2 256 bit AES ciphers.
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