Removing obsolete code.

ios/chrome/browser/ui/stack_view/stack_view_controller_perftest.mm

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import <UIKit/UIKit.h>
 
 #include "base/callback_helpers.h"
 #import "base/mac/bind_objc_block.h"
 #include "base/mac/foundation_util.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 141 matching lines @@
 class StackViewControllerPerfTest : public PerfTestWithBVC {
  public:
   StackViewControllerPerfTest() : PerfTestWithBVC("Stack View") {}
 
   void SetUp() override {
     // Opening a StackViewController is done only on iPhones, not on iPads.
     // This test is meaningless on an iPad.
     if (IsIPadIdiom())
       return;
 
-    [FullScreenController setHideOmniboxDelaySeconds:0.0];
-
     // Base class does most of the setup.
     PerfTestWithBVC::SetUp();
 
     current_url_index_ = 0;
     reuse_svc_ = false;
 
     // The testing delegate will receive stack view animation notifications.
     delegate_.reset([[StackViewControllerPerfTestDelegate alloc]
         initWithBrowserViewController:bvc_]);
   }
@@ skipping 225 matching lines @@
       CalculateAverage(close_times + 1, kNumTests - 1, NULL, &max_close);
   LogPerfTiming("Open cold", open_times[0]);
   LogPerfTiming("Open warm avg", open_avg);
   LogPerfTiming("Open warm max", max_open);
   LogPerfTiming("Close cold", close_times[0]);
   LogPerfTiming("Close cold avg", close_avg);
   LogPerfTiming("Close cold max", max_close);
 }
 
 }  // anonymous namespace