Chrome 138 escapes < and > in attributes on serialization (#28881)

Author: kidonng

api/Element.json

@@ -5710,14 +5710,7 @@
             "description": "Serializes `<` and `>` in attributes as `&amp;lt;` and `&amp;gt;` (see [this spec issue](https://github.com/whatwg/html/issues/6235))",
             "support": {
               "chrome": {
-                "version_added": "114",
-                "flags": [
-                  {
-                    "type": "preference",
-                    "name": "enable-experimental-web-platform-features",
-                    "value_to_set": "enabled"
-                  }
-                ]
+                "version_added": "138"
               },
               "chrome_android": "mirror",
               "edge": "mirror",
@@ -6094,14 +6087,7 @@
             "description": "Serializes `<` and `>` in attributes as `&amp;lt;` and `&amp;gt;` (see [this spec issue](https://github.com/whatwg/html/issues/6235))",
             "support": {
               "chrome": {
-                "version_added": "114",
-                "flags": [
-                  {
-                    "type": "preference",
-                    "name": "enable-experimental-web-platform-features",
-                    "value_to_set": "enabled"
-                  }
-                ]
+                "version_added": "138"
               },
               "chrome_android": "mirror",
               "edge": "mirror",
@@ -7374,14 +7360,7 @@
             "description": "Serializes `<` and `>` in attributes as `&amp;lt;` and `&amp;gt;` (see [this spec issue](https://github.com/whatwg/html/issues/6235))",
             "support": {
               "chrome": {
-                "version_added": "114",
-                "flags": [
-                  {
-                    "type": "preference",
-                    "name": "enable-experimental-web-platform-features",
-                    "value_to_set": "enabled"
-                  }
-                ]
+                "version_added": "138"
               },
               "chrome_android": "mirror",
               "edge": "mirror",

api/ShadowRoot.json

@@ -401,7 +401,7 @@
             "description": "Serializes `<` and `>` in attributes as `&amp;lt;` and `&amp;gt;` (see [this spec issue](https://github.com/whatwg/html/issues/6235))",
             "support": {
               "chrome": {
-                "version_added": false
+                "version_added": "138"
               },
               "chrome_android": "mirror",
               "edge": "mirror",
@@ -564,14 +564,7 @@
             "description": "Serializes `<` and `>` in attributes as `&amp;lt;` and `&amp;gt;` (see [this spec issue](https://github.com/whatwg/html/issues/6235))",
             "support": {
               "chrome": {
-                "version_added": "114",
-                "flags": [
-                  {
-                    "type": "preference",
-                    "name": "enable-experimental-web-platform-features",
-                    "value_to_set": "enabled"
-                  }
-                ]
+                "version_added": "138"
               },
               "chrome_android": "mirror",
               "edge": "mirror",