webrtc: use correct cwd for running tests

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

Index: scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_win_asan.json
diff --git a/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_win_asan.json b/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_win_asan.json
index 42e82cd8031995d51292be2b5b8e46f9bfd45fd7..703e1684bd06936f44eec2f7e4b532b8947874cb 100644
--- a/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_win_asan.json
+++ b/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_win_asan.json
@@ -247,6 +247,7 @@
       "[BUILDER_CACHE]\\win_asan\\src\\out\\Release\\audio_decoder_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]\\win_asan",
     "name": "audio_decoder_unittests"
   },
   {
@@ -271,6 +272,7 @@
       "[BUILDER_CACHE]\\win_asan\\src\\out\\Release\\common_audio_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]\\win_asan",
     "name": "common_audio_unittests"
   },
   {
@@ -295,6 +297,7 @@
       "[BUILDER_CACHE]\\win_asan\\src\\out\\Release\\common_video_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]\\win_asan",
     "name": "common_video_unittests"
   },
   {
@@ -319,6 +322,7 @@
       "[BUILDER_CACHE]\\win_asan\\src\\out\\Release\\modules_tests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]\\win_asan",
     "name": "modules_tests"
   },
   {
@@ -343,6 +347,7 @@
       "[BUILDER_CACHE]\\win_asan\\src\\out\\Release\\modules_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]\\win_asan",
     "name": "modules_unittests"
   },
   {
@@ -367,6 +372,7 @@
       "[BUILDER_CACHE]\\win_asan\\src\\out\\Release\\peerconnection_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]\\win_asan",
     "name": "peerconnection_unittests"
   },
   {
@@ -391,6 +397,7 @@
       "[BUILDER_CACHE]\\win_asan\\src\\out\\Release\\rtc_media_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]\\win_asan",
     "name": "rtc_media_unittests"
   },
   {
@@ -415,6 +422,7 @@
       "[BUILDER_CACHE]\\win_asan\\src\\out\\Release\\rtc_pc_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]\\win_asan",
     "name": "rtc_pc_unittests"
   },
   {
@@ -439,6 +447,7 @@
       "[BUILDER_CACHE]\\win_asan\\src\\out\\Release\\rtc_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]\\win_asan",
     "name": "rtc_unittests"
   },
   {
@@ -463,6 +472,7 @@
       "[BUILDER_CACHE]\\win_asan\\src\\out\\Release\\system_wrappers_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]\\win_asan",
     "name": "system_wrappers_unittests"
   },
   {
@@ -487,6 +497,7 @@
       "[BUILDER_CACHE]\\win_asan\\src\\out\\Release\\test_support_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]\\win_asan",
     "name": "test_support_unittests"
   },
   {
@@ -511,6 +522,7 @@
       "[BUILDER_CACHE]\\win_asan\\src\\out\\Release\\tools_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]\\win_asan",
     "name": "tools_unittests"
   },
   {
@@ -535,6 +547,7 @@
       "[BUILDER_CACHE]\\win_asan\\src\\out\\Release\\video_engine_tests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]\\win_asan",
     "name": "video_engine_tests"
   },
   {
@@ -559,6 +572,7 @@
       "[BUILDER_CACHE]\\win_asan\\src\\out\\Release\\voice_engine_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]\\win_asan",
     "name": "voice_engine_unittests"
   },
   {
@@ -583,6 +597,7 @@
       "[BUILDER_CACHE]\\win_asan\\src\\out\\Release\\xmllite_xmpp_unittests",
       "--"
     ],
+    "cwd": "[BUILDER_CACHE]\\win_asan",
     "name": "xmllite_xmpp_unittests"
   },
   {
@@ -606,6 +621,7 @@
       "--revision=f27fede2220bcd326aee3e86ddfd4ebd0fe58cb9",
       "webrtc_nonparallel_tests.exe"
     ],
+    "cwd": "[BUILDER_CACHE]\\win_asan",
     "name": "webrtc_nonparallel_tests"
   },
   {