Fix HintsFetcher test not passing offline check

This was changed back to the breaking version in https://chromium-review.googlesource.com/c/chromium/src/+/1783233/8/chrome/browser/previews/hints_fetcher_browsertest.cc

Bug: 1004245
Change-Id: I91804a39bd2b42d2c305ae224e55394c6327149a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1807333Reviewed-by: Michael Crouse <mcrouse@chromium.org>
Commit-Queue: Sophie Chang <sophiechang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696853}

chrome/browser/previews/hints_fetcher_browsertest.cc

@@ -101,9 +101,8 @@ class HintsFetcherDisabledBrowserTest
   ~HintsFetcherDisabledBrowserTest() override = default;
 
   void SetUpOnMainThread() override {
-    g_browser_process->network_quality_tracker()
-        ->ReportEffectiveConnectionTypeForTesting(
-            net::EFFECTIVE_CONNECTION_TYPE_2G);
+    content::NetworkConnectionChangeSimulator().SetConnectionType(
+        network::mojom::ConnectionType::CONNECTION_2G);
 
     InProcessBrowserTest::SetUpOnMainThread();
   }