No longer pass JS source when creating service worker code cache.

The old V8 API is being deprecated.

R=haraken@chromium.org

Change-Id: Iaa5af927df5522ad78ce2b3db2b663568855193e
Reviewed-on: https://chromium-review.googlesource.com/1026676Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553498}

third_party/blink/renderer/bindings/core/v8/v8_script_runner.cc

@@ -783,8 +783,7 @@ scoped_refptr<CachedMetadata> V8ScriptRunner::GenerateFullCodeCache(
   if (v8::ScriptCompiler::CompileUnboundScript(
           isolate, &source, v8::ScriptCompiler::kEagerCompile)
           .ToLocal(&unbound_script)) {
-    cached_data.reset(
-        v8::ScriptCompiler::CreateCodeCache(unbound_script, code));
+    cached_data.reset(v8::ScriptCompiler::CreateCodeCache(unbound_script));
     if (cached_data && cached_data->length) {
       cached_metadata = CachedMetadata::Create(
           CacheTag(kCacheTagCode, encoding.GetName()),