Extend enhanced protection flags to M90

Bug: 1097310
Change-Id: I5e91dbe8623f796a132671eb23a7a4ef9ce26ce9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2558758
Auto-Submit: Xinghui Lu <xinghuilu@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Commit-Queue: Varun Khaneja <vakh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830740}

chrome/browser/flag-metadata.json

@@ -3876,7 +3876,7 @@
       "xinghuilu",
       "chrome-safebrowsing-core@google.com"
     ],
-    "expiry_milestone": 89
+    "expiry_milestone": 90
   },
   {
     "name": "privacy-sandbox-settings",
@@ -4085,7 +4085,7 @@
       "xinghuilu",
       "chrome-safebrowsing-core@google.com"
     ],
-    "expiry_milestone": 88
+    "expiry_milestone": 90
   },
   {
     "name": "safe-browsing-enhanced-protection-message-in-interstitials",
@@ -4113,7 +4113,7 @@
       "xinghuilu",
       "chrome-safebrowsing-core@google.com"
     ],
-    "expiry_milestone": 88
+    "expiry_milestone": 90
   },
   {
     "name": "safety-check-android",