Enable unit tests (#70)

* Re-enable ffmpeg build with msvc

* Enable unit tests

Author: taste1981

call/BUILD.gn

@@ -449,7 +449,7 @@ if (rtc_include_tests) {
       "../test/time_controller:time_controller",
       "../video",
       "adaptation:resource_adaptation_test_utilities",
-      "//test/scenario:scenario",
+      "../test/scenario:scenario",
       "//testing/gmock",
       "//testing/gtest",
     ]

test/network/BUILD.gn

@@ -120,7 +120,7 @@ rtc_library("cross_traffic_unittest") {
     "../../rtc_base",
     "../../rtc_base:logging",
     "../../rtc_base:rtc_event",
-    "//test/time_controller:time_controller",
+    "../../test/time_controller:time_controller",
   ]
   absl_deps = [ "//third_party/abseil-cpp/absl/memory" ]
 }

video/adaptation/BUILD.gn

@@ -94,8 +94,8 @@ if (rtc_include_tests) {
       "../../rtc_base:rtc_task_queue",
       "../../rtc_base:task_queue_for_test",
       "../../test:field_trial",
-      "//test:rtc_expect_death",
-      "//test:test_support",
+      "../../test:rtc_expect_death",
+      "../../test:test_support",
       "//testing/gtest",
     ]
     absl_deps = [ "//third_party/abseil-cpp/absl/types:optional" ]