Fix the snapshot_cache unittests.

ios/chrome/browser/experimental_flags.mm

Index: ios/chrome/browser/experimental_flags.mm
diff --git a/ios/chrome/browser/experimental_flags.mm b/ios/chrome/browser/experimental_flags.mm
index 32975b428b551f88c4fe9d568ea67d18d89c5f43..42c937deaf119004e56b140dff23ef27183f9894 100644
--- a/ios/chrome/browser/experimental_flags.mm
+++ b/ios/chrome/browser/experimental_flags.mm
@@ -95,10 +95,10 @@ bool IsTabSwitcherEnabled() {
     return false;
   }
 
-  // Check if the finch experiment is turned on.
+  // Check if the finch experiment is turned off.
   std::string group_name = base::FieldTrialList::FindFullName("IOSTabSwitcher");
-  return base::StartsWith(group_name, "Enabled",
-                          base::CompareCase::INSENSITIVE_ASCII);
+  return !base::StartsWith(group_name, "Disabled",
+                           base::CompareCase::INSENSITIVE_ASCII);
 }
 
 bool IsReadingListEnabled() {