flags: run expiration process for M80

This change:
1) Marks flags that expired in M80 or earlier as expired, as we are now
   in M80;
2) Marks flags that expired in M76 or earlier as hard-expired by
   removing the temporary-unexpire-flags-m76 flag and associated
   feature.

TPMs will begin filing cleanup bugs for the remaining M76 and earlier
flags at this point.

Bug: 953690
Change-Id: Ibd6922fe1ffc5dbb090e91cdd558a4e60260e345
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1913866
Reviewed-by: Avi Drissman <[email protected]>
Commit-Queue: Elly Fong-Jones <[email protected]>
Cr-Commit-Position: refs/heads/master@{#715307}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 70515c3..22f213d 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -1274,10 +1274,10 @@
 extern const char kTurnOffStreamingMediaCachingName[];
 extern const char kTurnOffStreamingMediaCachingDescription[];
 
-extern const char kUnexpireFlagsM76Name[];
-extern const char kUnexpireFlagsM76Description[];
 extern const char kUnexpireFlagsM78Name[];
 extern const char kUnexpireFlagsM78Description[];
+extern const char kUnexpireFlagsM80Name[];
+extern const char kUnexpireFlagsM80Description[];
 
 extern const char kUnsafeWebGPUName[];
 extern const char kUnsafeWebGPUDescription[];