Use the Chromium libfuzzer template instead of rolling our own.

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 3e59339299fb33cc65f0430c59822814d9e4f20c..29867a1a7db4885948c32268d6ee08f41316da43 100644
--- a/webrtc/test/fuzzers/BUILD.gn
+++ b/webrtc/test/fuzzers/BUILD.gn
@@ -7,7 +7,8 @@
 # be found in the AUTHORS file in the root of the source tree.
 
 import("//build/config/features.gni")
-import("webrtc_fuzzer.gni")
+import("//testing/test.gni")
+import("//testing/libfuzzer/fuzzer_test.gni")
 
 static_library("webrtc_fuzzer_main") {
   public_configs = [ "../..:common_inherited_config" ]
@@ -21,6 +22,18 @@ static_library("webrtc_fuzzer_main") {
   ]
 }
 
+template("webrtc_fuzzer_test") {
+  fuzzer_test(target_name) {
+    forward_variables_from(invoker, "*")
+    deps += [ ":webrtc_fuzzer_main" ]
+    if (is_clang) {
+      # Suppress warnings from Chrome's Clang plugins.
+      # See http://code.google.com/p/webrtc/issues/detail?id=163 for details
+      suppressed_configs = [ "//build/config/clang:find_bad_constructs" ]
+    }
+  }
+}
+
 webrtc_fuzzer_test("h264_depacketizer_fuzzer") {
   sources = [
     "h264_depacketizer_fuzzer.cc",