Bug 961949 follow-up: use master branch in apitrace.

Change-Id: Idcd85b665306f8cfbbc611d6cbbd5f09c2340001
Merge pull request #148 from vicamo/bugzilla/961949/tarako-repo-sync-fail

Bug 961949 follow-up: use master branch in apitrace.
use local aosp mirror

Change-Id: If12e0b6e526daf83a6ce0692129397e478da900d