Remove unnecessary base::JSONReader ctor call

The base::JSONReader::Read method is a static method.

Bug: 1070409
Change-Id: Ie9a063cd25b062d56f06a68c364d3c32bdc1ff9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2247926
Commit-Queue: Nigel Tao <nigeltao@chromium.org>
Commit-Queue: Abhishek Arya <inferno@chromium.org>
Reviewed-by: Abhishek Arya <inferno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779003}

components/update_client/protocol_serializer_fuzzer.cc

@@ -47,8 +47,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   std::string request_serialized = serializer->Serialize(request);
 
   // Any request we serialize should be valid JSON.
-  base::JSONReader json_reader;
-  CHECK(json_reader.Read(request_serialized));
+  CHECK(base::JSONReader::Read(request_serialized));
   return 0;
 }
 }  // namespace update_client