Headless: remove a couple of unused methods in tests

TBR=kvitekp@chromium.org

Change-Id: I53da1f16c88d4a3c5c5bc203a9e036c6bb93e0d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1982228Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727526}

headless/test/headless_browser_test.cc

@@ -217,9 +217,7 @@ void HeadlessBrowserTest::RunAsynchronousTest() {
   EXPECT_FALSE(run_loop_);
   run_loop_ = std::make_unique<base::RunLoop>(
       base::RunLoop::Type::kNestableTasksAllowed);
-  PreRunAsynchronousTest();
   run_loop_->Run();
-  PostRunAsynchronousTest();
   run_loop_ = nullptr;
 }
 

headless/test/headless_browser_test.h

@@ -69,8 +69,6 @@ class HeadlessBrowserTest : public content::BrowserTestBase {
   // Run an asynchronous test in a nested run loop. The caller should call
   // FinishAsynchronousTest() to notify that the test should finish.
   void RunAsynchronousTest();
-  virtual void PreRunAsynchronousTest() {}
-  virtual void PostRunAsynchronousTest() {}
 
   // Synchronously waits for a tab to finish loading.
   bool WaitForLoad(HeadlessWebContents* web_contents);