Clean up ChromeTabbedActivity#initDeferredStartupForActivity.

Bug: 1092931
Change-Id: I07e6f2b343ec368ce161a742f2b69548b44e2fd4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2261359
Commit-Queue: Xi Han <hanxi@chromium.org>
Commit-Queue: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781541}

chrome/android/java/src/org/chromium/chrome/browser/ChromeTabbedActivity.java

@@ -1719,9 +1719,7 @@ public class ChromeTabbedActivity extends ChromeActivity<ChromeActivityComponent
             HomepagePromoVariationManager.getInstance().tagSyntheticHomepagePromoSeenGroup();
 
             DefaultBrowserPromoUtils.maybeRecordOutcomeOnStart();
-        });
 
-        DeferredStartupHandler.getInstance().addDeferredTask(() -> {
             if (mStartSurface != null && mOverviewShownOnStart) {
                 mStartSurface.onOverviewShownAtLaunch(getOnCreateTimestampUptimeMs());
             }