[libFuzzer][Windows] Fix GN errors when libs is defined in fuzzer_test

TBR=mmoroz@chromium.org

Change-Id: Ida8773dbc2d4d13a04dc96b2afc84e1a8d0c94f4
Bug: 904877
Reviewed-on: https://chromium-review.googlesource.com/c/1343245Reviewed-by: Jonathan Metzman <metzman@chromium.org>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Commit-Queue: Jonathan Metzman <metzman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609505}

testing/libfuzzer/fuzzer_test.gni

@@ -49,10 +49,6 @@ template("fuzzer_test") {
       test_deps += invoker.deps
     }
 
-    if (defined(invoker.libs)) {
-      libs = invoker.libs
-    }
-
     if (defined(invoker.seed_corpus) || defined(invoker.seed_corpuses)) {
       assert(!(defined(invoker.seed_corpus) && defined(invoker.seed_corpuses)),
              "Do not use both seed_corpus and seed_corpuses for $target_name.")
@@ -198,6 +194,7 @@ template("fuzzer_test") {
                                "defines",
                                "include_dirs",
                                "sources",
+                               "libs",
                              ])
       deps = test_deps