Replace the sdk repository reference with a hard sha reference

The tag apparently has different meanings/contents in different
google mirrors for this particular repo... FUN!

Change-Id: I5f9335af4da7114d83457ca041026f3be99c32ce
Switch to our own fork of ART

Change-Id: I85ca84303ce53183892911aadae921800a1415d5
Underp noto-fonts, too

Same problem as prebuilts/sdk

Change-Id: Ic47cd00acd9cb15c1b4de81aa813e7a0381045ef
4.4_r1 -> 4.4_r1.2

Change-Id: Ide5eb79266c984cea0feeee5ddd46161c56624b9
Switch to our fork of chromium_org

Change-Id: I80e11eba8482bee1c24d013c546d9b3ef2e90bc1