Cleanup io_thread_browsertest.cc

There was some leftover code from https://crrev.com/c/1143261

BUG=865350

Change-Id: Ibe6561d4da605b4b8802e8f3862a023155c4f051
Reviewed-on: https://chromium-review.googlesource.com/1175122Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Sergio Villar <svillar@igalia.com>
Cr-Commit-Position: refs/heads/master@{#584012}

chrome/browser/io_thread_browsertest.cc

@@ -33,8 +33,6 @@
 #include "net/test/embedded_test_server/embedded_test_server.h"
 #include "net/test/embedded_test_server/simple_connection_listener.h"
 #include "net/traffic_annotation/network_traffic_annotation_test_helper.h"
-#include "net/url_request/url_fetcher.h"
-#include "net/url_request/url_fetcher_delegate.h"
 #include "net/url_request/url_request_context.h"
 #include "services/network/public/cpp/simple_url_loader.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -42,24 +40,6 @@
 
 namespace {
 
-// URLFetcherDelegate that can wait for a request to succeed.
-class TestURLFetcherDelegate : public net::URLFetcherDelegate {
- public:
-  TestURLFetcherDelegate() {}
-  ~TestURLFetcherDelegate() override {}
-
-  void OnURLFetchComplete(const net::URLFetcher* source) override {
-    run_loop_.Quit();
-  }
-
-  void WaitForCompletion() { run_loop_.Run(); }
-
- private:
-  base::RunLoop run_loop_;
-
-  DISALLOW_COPY_AND_ASSIGN(TestURLFetcherDelegate);
-};
-
 // Runs a task on the IOThread and waits for it to complete.
 void RunOnIOThreadBlocking(base::OnceClosure task) {
   base::RunLoop run_loop;