ServiceWorkerSingleScriptUpdateCheckerTest doesn't need test helper

Tests in ServiceWorkerSingleScriptUpdateCheckerTest don't depend
on EmbeddedWorkerTestHelper. Remove the helper.

Bug: N/A
Change-Id: Ia236ee0bfe20e38b18185a2653f6a6d30d363619
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2291295Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#787604}

content/browser/service_worker/service_worker_single_script_update_checker_unittest.cc

@@ -10,7 +10,6 @@
 #include "base/run_loop.h"
 #include "base/test/bind_test_util.h"
 #include "base/test/scoped_feature_list.h"
-#include "content/browser/service_worker/embedded_worker_test_helper.h"
 #include "content/browser/service_worker/service_worker_context_wrapper.h"
 #include "content/browser/service_worker/service_worker_test_utils.h"
 #include "content/public/test/browser_task_environment.h"
@@ -71,13 +70,6 @@ class ServiceWorkerSingleScriptUpdateCheckerTest : public testing::Test {
   }
   ~ServiceWorkerSingleScriptUpdateCheckerTest() override = default;
 
-  ServiceWorkerStorage* storage() { return helper_->context()->storage(); }
-
-  void SetUp() override {
-    helper_ = std::make_unique<EmbeddedWorkerTestHelper>(base::FilePath());
-    storage()->LazyInitializeForTest();
-  }
-
   size_t TotalBytes(const std::vector<std::string>& data_chunks) {
     size_t bytes = 0;
     for (const auto& data : data_chunks)
@@ -193,7 +185,6 @@ class ServiceWorkerSingleScriptUpdateCheckerTest : public testing::Test {
 
  protected:
   BrowserTaskEnvironment task_environment_;
-  std::unique_ptr<EmbeddedWorkerTestHelper> helper_;
   std::unique_ptr<TestBrowserContext> browser_context_;
 
  private: