Fix build/isolate.gypi path in webrtc_tests.gypi.

BUG=2535
R=kjellander@webrtc.org
TBR=niklas.enbom@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/3039005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5045 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/webrtc_tests.gypi b/webrtc/webrtc_tests.gypi
index 4073403..bcf3b13 100644
--- a/webrtc/webrtc_tests.gypi
+++ b/webrtc/webrtc_tests.gypi
@@ -70,7 +70,7 @@
             'video_engine_tests',
           ],
           'includes': [
-            '../build/isolate.gypi',
+            'build/isolate.gypi',
             'video_engine_tests.isolate',
           ],
           'sources': [