webrtc: use correct cwd for running tests

scripts/slave/recipes/webrtc/standalone.expected/client_webrtc_mac_asan.json

Index: scripts/slave/recipes/webrtc/standalone.expected/client_webrtc_mac_asan.json
diff --git a/scripts/slave/recipes/webrtc/standalone.expected/client_webrtc_mac_asan.json b/scripts/slave/recipes/webrtc/standalone.expected/client_webrtc_mac_asan.json
index b98ee103e035cbe16aac46ab27b2610aa0d75b39..a3c34cf377e58bcc25f963430c431188d790a76b 100644
--- a/scripts/slave/recipes/webrtc/standalone.expected/client_webrtc_mac_asan.json
+++ b/scripts/slave/recipes/webrtc/standalone.expected/client_webrtc_mac_asan.json
@@ -274,6 +274,7 @@
       "[BUILDER_CACHE]/Mac_Asan/src/out/Release/audio_decoder_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/Mac_Asan",
     "name": "audio_decoder_unittests"
   },
   {
@@ -299,6 +300,7 @@
       "[BUILDER_CACHE]/Mac_Asan/src/out/Release/common_audio_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/Mac_Asan",
     "name": "common_audio_unittests"
   },
   {
@@ -324,6 +326,7 @@
       "[BUILDER_CACHE]/Mac_Asan/src/out/Release/common_video_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/Mac_Asan",
     "name": "common_video_unittests"
   },
   {
@@ -349,6 +352,7 @@
       "[BUILDER_CACHE]/Mac_Asan/src/out/Release/modules_tests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/Mac_Asan",
     "name": "modules_tests"
   },
   {
@@ -374,6 +378,7 @@
       "[BUILDER_CACHE]/Mac_Asan/src/out/Release/modules_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/Mac_Asan",
     "name": "modules_unittests"
   },
   {
@@ -399,6 +404,7 @@
       "[BUILDER_CACHE]/Mac_Asan/src/out/Release/peerconnection_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/Mac_Asan",
     "name": "peerconnection_unittests"
   },
   {
@@ -424,6 +430,7 @@
       "[BUILDER_CACHE]/Mac_Asan/src/out/Release/rtc_media_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/Mac_Asan",
     "name": "rtc_media_unittests"
   },
   {
@@ -449,6 +456,7 @@
       "[BUILDER_CACHE]/Mac_Asan/src/out/Release/rtc_pc_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/Mac_Asan",
     "name": "rtc_pc_unittests"
   },
   {
@@ -474,6 +482,7 @@
       "[BUILDER_CACHE]/Mac_Asan/src/out/Release/rtc_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/Mac_Asan",
     "name": "rtc_unittests"
   },
   {
@@ -499,6 +508,7 @@
       "[BUILDER_CACHE]/Mac_Asan/src/out/Release/system_wrappers_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/Mac_Asan",
     "name": "system_wrappers_unittests"
   },
   {
@@ -524,6 +534,7 @@
       "[BUILDER_CACHE]/Mac_Asan/src/out/Release/test_support_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/Mac_Asan",
     "name": "test_support_unittests"
   },
   {
@@ -549,6 +560,7 @@
       "[BUILDER_CACHE]/Mac_Asan/src/out/Release/tools_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/Mac_Asan",
     "name": "tools_unittests"
   },
   {
@@ -574,6 +586,7 @@
       "[BUILDER_CACHE]/Mac_Asan/src/out/Release/video_engine_tests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/Mac_Asan",
     "name": "video_engine_tests"
   },
   {
@@ -599,6 +612,7 @@
       "[BUILDER_CACHE]/Mac_Asan/src/out/Release/voice_engine_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/Mac_Asan",
     "name": "voice_engine_unittests"
   },
   {
@@ -624,6 +638,7 @@
       "[BUILDER_CACHE]/Mac_Asan/src/out/Release/xmllite_xmpp_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/Mac_Asan",
     "name": "xmllite_xmpp_unittests"
   },
   {
@@ -649,6 +664,7 @@
       "[BUILDER_CACHE]/Mac_Asan/src/out/Release/libjingle_peerconnection_objc_test.app/Contents/MacOS/libjingle_peerconnection_objc_test",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]/Mac_Asan",
     "name": "libjingle_peerconnection_objc_test"
   },
   {
@@ -676,6 +692,7 @@
       "--enable-asan",
       "webrtc_nonparallel_tests"
     ],
+    "cwd": "[BUILDER_CACHE]/Mac_Asan",
     "name": "webrtc_nonparallel_tests"
   },
   {