Enable unit tests (#70)

* Re-enable ffmpeg build with msvc

* Enable unit tests

Author: taste1981

call/BUILD.gn

@@ -435,7 +435,7 @@ if (rtc_include_tests) {
       "../test:video_test_common",
       "../test/time_controller:time_controller",
       "../video",
-      "//test/scenario:scenario",
+      "../test/scenario:scenario",
       "//testing/gmock",
       "//testing/gtest",
       "//third_party/abseil-cpp/absl/container:inlined_vector",

test/network/BUILD.gn

@@ -113,7 +113,7 @@ rtc_library("cross_traffic_unittest") {
     "../../rtc_base",
     "../../rtc_base:logging",
     "../../rtc_base:rtc_event",
-    "//test/time_controller:time_controller",
+    "../../test/time_controller:time_controller",
     "//third_party/abseil-cpp/absl/memory",
   ]
 }

video/adaptation/BUILD.gn

@@ -79,8 +79,8 @@ if (rtc_include_tests) {
       "../../rtc_base:rtc_numerics",
       "../../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",
       "//third_party/abseil-cpp/absl/types:optional",
     ]