flags: purge removed flags from metadata

Bug: None
Change-Id: If52c1528ba8cd0f6f3461bf6bb20ba7d3b5b605b
Tbr: avi@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2346791Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796458}

chrome/browser/flag-metadata.json

@@ -221,11 +221,6 @@
     "owners": [ "minch" ],
     "expiry_milestone": 78
   },
-  {
-    "name": "ash-swiping-from-left-edge-to-go-back",
-    "owners": [ "minch" ],
-    "expiry_milestone": 85
-  },
   {
     "name": "audio-worklet-realtime-thread",
     "owners": [ "//third_party/blink/renderer/modules/webaudio/OWNERS" ],
@@ -546,11 +541,6 @@
     "owners": [ "arakeri@microsoft.com" ],
     "expiry_milestone": 90
   },
-  {
-    "name": "contained-browser-bvc",
-    "owners": [ "gambard", "bling-flags" ],
-    "expiry_milestone": 87
-  },
   {
     "name": "content-indexing-download-home",
     "owners": [ "shaktisahu", "dtrainor" ],
@@ -2731,11 +2721,6 @@
     "owners": [ "wenyufu", "chrome-android-app@chromium.org" ],
     "expiry_milestone": 86
   },
-  {
-    "name": "http-auth-committed-interstitials",
-    "owners": [ "jdeblasio", "estark" ],
-    "expiry_milestone": 77
-  },
   {
     "name": "ignore-gpu-blocklist",
     "owners": [ "kbr", "zmo" ],
@@ -2760,11 +2745,6 @@
     "owners": [ "dullweber", "huanzhong" ],
     "expiry_milestone": 86
   },
-  {
-    "name": "improved-cookie-controls-for-third-party-cookie-blocking",
-    "owners": [ "dullweber", "huanzhong" ],
-    "expiry_milestone": 86
-  },
   {
     "name": "impulse-scroll-animations",
     "owners": [ "dlibby@microsoft.com", "sarsha@microsoft.com" ],
@@ -3699,11 +3679,6 @@
     "owners": [ "afakhry" ],
     "expiry_milestone": 83
   },
-  {
-    "name": "qr-code-generation",
-    "owners": [ "seblalancette" ],
-    "expiry_milestone": 88
-  },
   {
     "name": "query-tiles",
     "owners": [ "shaktisahu", "qinmin" ],
@@ -4231,11 +4206,6 @@
     // customize switches.
     "expiry_milestone": -1
   },
-  {
-    "name": "tls13-hardening-for-local-anchors",
-    "owners": [ "davidben", "svaldez" ],
-    "expiry_milestone": 85
-  },
   {
     "name": "toolbar-container",
     "owners": [ "thegreenfrog", "bling-flags" ],
@@ -4509,11 +4479,6 @@
     // with a single headset.
     "expiry_milestone": -1
   },
-  {
-    "name": "win-use-hybrid-spellchecker",
-    "owners": [ "gujen@google.com", "chrome-language@google.com" ],
-    "expiry_milestone": 88
-  },
   {
     "name": "win-use-native-spellchecker",
     "owners": [ "gujen@google.com", "chrome-language@google.com" ],