GN: Introduce templates.

webrtc/test/fuzzers/BUILD.gn

Index: webrtc/test/fuzzers/BUILD.gn
diff --git a/webrtc/test/fuzzers/BUILD.gn b/webrtc/test/fuzzers/BUILD.gn
index 6928062a7fe4381d3cdf1fd0464789c1bb49b6f1..d602a764aa0d29bbba51a543748525d44448ed75 100644
--- a/webrtc/test/fuzzers/BUILD.gn
+++ b/webrtc/test/fuzzers/BUILD.gn
@@ -9,9 +9,8 @@
 import("//build/config/features.gni")
 import("//build_overrides/webrtc.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
-import("//testing/test.gni")
 
-static_library("webrtc_fuzzer_main") {
+rtc_static_library("webrtc_fuzzer_main") {
   public_configs = [ "../..:common_inherited_config" ]
   sources = [
     "webrtc_fuzzer_main.cc",
@@ -119,7 +118,7 @@ webrtc_fuzzer_test("congestion_controller_feedback_fuzzer") {
   ]
 }
 
-source_set("audio_decoder_fuzzer") {
+rtc_source_set("audio_decoder_fuzzer") {
   public_configs = [ "../..:common_inherited_config" ]
   sources = [
     "audio_decoder_fuzzer.cc",