Using realpath instead of android_src

BUG=367235
R=johannkoenig@google.com

Review URL: https://codereview.chromium.org/250993002

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/libvpx@266258 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
2 files changed