Removing iPad Tab Switcher experimental flag.

ios/chrome/browser/metrics/tab_usage_recorder_egtest.mm

 // Copyright 2016 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 <EarlGrey/EarlGrey.h>
 #import <XCTest/XCTest.h>
 
 #include "base/mac/bind_objc_block.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/stringprintf.h"
@@ skipping 145 matching lines @@
       IDS_IOS_TAB_STRIP_LEAVE_TAB_SWITCHER);
   [[EarlGrey selectElementWithMatcher:matcher] performAction:grey_tap()];
 }
 
 // Swithches to normal mode using swith button (iPad) or stack view (iPhone).
 // Assumes current mode is Incognito.
 void SwitchToNormalMode() {
   GREYAssertTrue(chrome_test_util::IsIncognitoMode(),
                  @"Switching to normal mode is only allowed from Incognito.");
   if (IsIPadIdiom()) {
-    if (experimental_flags::IsTabSwitcherEnabled()) {
-      // Enter the tab switcher.
-      id<GREYMatcher> tabSwitcherEnterButton =
-          grey_accessibilityLabel(l10n_util::GetNSStringWithFixup(
-              IDS_IOS_TAB_STRIP_ENTER_TAB_SWITCHER));
-      [[EarlGrey selectElementWithMatcher:tabSwitcherEnterButton]
-          performAction:grey_tap()];
+    // Enter the tab switcher.
+    id<GREYMatcher> tabSwitcherEnterButton = grey_accessibilityLabel(
+        l10n_util::GetNSStringWithFixup(IDS_IOS_TAB_STRIP_ENTER_TAB_SWITCHER));
+    [[EarlGrey selectElementWithMatcher:tabSwitcherEnterButton]
+        performAction:grey_tap()];
 
-      // Select the non incognito panel.
-      id<GREYMatcher> tabSwitcherHeaderPanelButton =
-          grey_accessibilityLabel(l10n_util::GetNSStringWithFixup(
-              IDS_IOS_TAB_SWITCHER_HEADER_NON_INCOGNITO_TABS));
-      [[EarlGrey selectElementWithMatcher:tabSwitcherHeaderPanelButton]
-          performAction:grey_tap()];
+    // Select the non incognito panel.
+    id<GREYMatcher> tabSwitcherHeaderPanelButton =
+        grey_accessibilityLabel(l10n_util::GetNSStringWithFixup(
+            IDS_IOS_TAB_SWITCHER_HEADER_NON_INCOGNITO_TABS));
+    [[EarlGrey selectElementWithMatcher:tabSwitcherHeaderPanelButton]
+        performAction:grey_tap()];
 
-      // Leave the tab switcher.
-      CloseTabSwitcher();
-    } else {
-      [[EarlGrey selectElementWithMatcher:
-                     chrome_test_util::ButtonWithAccessibilityLabelId(
-                         IDS_IOS_SWITCH_BROWSER_MODE_LEAVE_INCOGNITO)]
-          performAction:grey_tap()];
-    }
+    // Leave the tab switcher.
+    CloseTabSwitcher();
   } else {
     [[EarlGrey selectElementWithMatcher:
                    chrome_test_util::ButtonWithAccessibilityLabelId(
                        IDS_IOS_TOOLBAR_SHOW_TABS)] performAction:grey_tap()];
     [[EarlGrey selectElementWithMatcher:
                    chrome_test_util::ButtonWithAccessibilityLabelId(
                        IDS_IOS_TOOLS_MENU_NEW_INCOGNITO_TAB)]
         performAction:grey_swipeSlowInDirection(kGREYDirectionRight)];
     [[EarlGrey selectElementWithMatcher:
                    chrome_test_util::ButtonWithAccessibilityLabelId(
@@ skipping 753 matching lines @@
     [[GREYUIThreadExecutor sharedInstance] drainUntilIdle];
   }
   // The deleted tabs are purged during foregrounding and backgrounding.
   chrome_test_util::SimulateTabsBackgrounding();
   // Make sure |evicted_tabs_| purged the deleted tabs.
   int evicted = chrome_test_util::GetEvictedMainTabCount();
   GREYAssertEqual(evicted, 0, @"Check number of evicted tabs");
 }
 
 @end