[Flags] Extend two flags to M79

This CL extends two flags, animated-avatar-button and
enable-history-favicons-google-server-query till M79.

Bug: 967317
Change-Id: Ieb4c9b96bfd000a88e63490694b438d7c0cfcad1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1859614
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Auto-Submit: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705512}

chrome/browser/flag-metadata.json

@@ -105,7 +105,7 @@
   {
     "name": "animated-avatar-button",
     "owners": ["jkrcal"],
-    "expiry_milestone": 78
+    "expiry_milestone": 79
   },
   {
     "name": "app-management",
@@ -1340,7 +1340,7 @@
   {
     "name": "enable-history-favicons-google-server-query",
     "owners": ["victorvianna", "jkrcal"],
-    "expiry_milestone": 78
+    "expiry_milestone": 79
   },
   {
     "name": "enable-history-manipulation-intervention",