Removing iPad Tab Switcher experimental flag.

ios/chrome/browser/about_flags.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.
 
 // Implementation of about_flags for iOS that sets flags based on experimental
 // settings.
 
 #include "ios/chrome/browser/about_flags.h"
 
 #include <stddef.h>
@@ skipping 85 matching lines @@
                                     BUILDFLAG(GOOGLE_TEST_OAUTH_CLIENT_ID));
     command_line->AppendSwitchASCII(switches::kOAuth2ClientSecret,
                                     BUILDFLAG(GOOGLE_TEST_OAUTH_CLIENT_SECRET));
   }
 
   // Populate command line flag for the tab strip auto scroll new tabs
   // experiment from the configuration plist.
   if ([defaults boolForKey:@"TabStripAutoScrollNewTabsDisabled"])
     command_line->AppendSwitch(switches::kDisableTabStripAutoScrollNewTabs);
 
-  // Populate command line flag for the Tab Switcher experiment from the
-  // configuration plist.
-  NSString* enableTabSwitcher = [defaults stringForKey:@"EnableTabSwitcher"];
-  if ([enableTabSwitcher isEqualToString:@"Enabled"]) {
-    command_line->AppendSwitch(switches::kEnableTabSwitcher);
-  } else if ([enableTabSwitcher isEqualToString:@"Disabled"]) {
-    command_line->AppendSwitch(switches::kDisableTabSwitcher);
-  }
-
   // Populate command line flag for the SnapshotLRUCache experiment from the
   // configuration plist.
   NSString* enableLRUSnapshotCache =
       [defaults stringForKey:@"SnapshotLRUCache"];
   if ([enableLRUSnapshotCache isEqualToString:@"Enabled"]) {
     command_line->AppendSwitch(switches::kEnableLRUSnapshotCache);
   } else if ([enableLRUSnapshotCache isEqualToString:@"Disabled"]) {
     command_line->AppendSwitch(switches::kDisableLRUSnapshotCache);
   }
 
@@ skipping 207 matching lines @@
 }
 
 namespace testing {
 
 const flags_ui::FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing