Extend passthrough flag expiry milestone to M135.

Extend the about:flags for "use-passthrough-command-decoder" to M135.

Bug: 1216037
Change-Id: I35f46e91150b7d01c04fac6d498f006f4c26e292
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5041279
Auto-Submit: vikas soni <vikassoni@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1226305}

chrome/browser/flag-metadata.json

@@ -8036,7 +8036,7 @@
   {
     "name": "use-passthrough-command-decoder",
     "owners": [ "//third_party/angle/OWNERS" ],
-    "expiry_milestone": 120
+    "expiry_milestone": 135
   },
   {
     "name": "use-search-click-for-right-click",