Move rtc_api_unittests into rtc_unittests.

webrtc/api/BUILD.gn

Index: webrtc/api/BUILD.gn
diff --git a/webrtc/api/BUILD.gn b/webrtc/api/BUILD.gn
index 5a6051e74440a34d352e2d1fd87fda062539680b..78079b31fad845709cf01f7ae8f2ef1b1ff7456e 100644
--- a/webrtc/api/BUILD.gn
+++ b/webrtc/api/BUILD.gn
@@ -201,9 +201,8 @@ if (rtc_include_tests) {
     }
   }
 
-  rtc_test("rtc_api_unittests") {
+  rtc_source_set("rtc_api_unittests") {
     testonly = true
-
     sources = [
       "rtcerror_unittest.cc",
     ]
@@ -215,14 +214,7 @@ if (rtc_include_tests) {
 
     deps = [
       ":libjingle_peerconnection_api",
-      "../base:rtc_base_tests_main",
-      "../base:rtc_base_tests_utils",
-      "../system_wrappers:metrics_default",
-      "../test:test_support",
+      "//webrtc/test:test_support",
     ]
-
-    if (is_android) {
-      deps += [ "//testing/android/native_test:native_test_support" ]
-    }
   }
 }