Allow audioproc_unittest to be run with an absolute path.
Allow audioproc_unittest to be run with an absolute path.

r2942 depended on TestSuite, which in turn depends on Gmock. This is not
available in the Android platform build. Here, we call SetExecutablePath
directly instead.

TBR=kjellander@webrtc.org
TESTED=invoked audioproc_unittest with an absolute path in a working directory
outside the tree.

Review URL: https://webrtc-codereview.appspot.com/892005

git-svn-id: 9b397c5dfe384c04b1b200d5305b653241000171@2944 4adac7df-926f-26a2-2b94-8c16560cd09d

lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override,lukeweber/webrtc-src-override