Removing iPad Tab Switcher experimental flag.

ios/chrome/browser/ui/main/browser_view_wrangler.mm

Index: ios/chrome/browser/ui/main/browser_view_wrangler.mm
diff --git a/ios/chrome/browser/ui/main/browser_view_wrangler.mm b/ios/chrome/browser/ui/main/browser_view_wrangler.mm
index d0bc024d2b485a221677aeddb5a3ad7512b20618..8f2ef97dcbe5316eada14799dc9c10b8767d3fe8 100644
--- a/ios/chrome/browser/ui/main/browser_view_wrangler.mm
+++ b/ios/chrome/browser/ui/main/browser_view_wrangler.mm
@@ -212,16 +212,6 @@
   [self updateDeviceSharingManager];
 }
 
-// Called when the number of tabs changes. Updates the switcher button
-// visibility in the various modes on tablet.
-- (void)tabModelDidChangeTabCount:(TabModel*)notifiedTabModel {
-  // If in tablet, update the mode switcher icon based on the number of tabs
-  // in the incognito tab strip. Doing this all the time simplifies a lot
-  // of the state transition logic and setting the property to the same value
-  // incurs no re-layout penalty.
-  [self updateModeToggle];
-}
-
 #pragma mark - Other public methods
 
 - (void)updateDeviceSharingManager {
@@ -291,13 +281,6 @@
   }
 }
 
-- (void)updateModeToggle {
-  if (IsIPadIdiom()) {
-    self.mainBVC.hasModeToggleSwitch = self.otrTabModel.count ? YES : NO;
-    self.otrBVC.hasModeToggleSwitch = YES;
-  }
-}
-
 #pragma mark - Internal methods
 
 - (TabModel*)buildOtrTabModel:(BOOL)empty {