Clean up flag for a launched feature

This feature shipped in M86, with no issues reported.

https://chromestatus.com/feature/6143552666992640

Bug: 1067384
Change-Id: Ic27c756b6df3e2470b4d55194c18609df5683f13
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2633965
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Commit-Queue: Yu Han <yuzhehan@chromium.org>
Reviewed-by: Yu Han <yuzhehan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844906}

content/child/runtime_features.cc

@@ -374,8 +374,6 @@ void SetRuntimeFeaturesFromChromiumFeatures() {
            blink::features::kLinkDisabledNewSpecBehavior},
           {"OriginPolicy", features::kOriginPolicy},
           {"OriginIsolationHeader", features::kOriginIsolationHeader},
-          {"ParentNodeReplaceChildren",
-           blink::features::kParentNodeReplaceChildren},
           {"RawClipboard", blink::features::kRawClipboard},
           {"StorageAccessAPI", blink::features::kStorageAccessAPI},
           {"TargetBlankImpliesNoOpener",

third_party/blink/common/features.cc

@@ -123,9 +123,6 @@ const base::Feature kNavigationPredictor {
 #endif
 };
 
-const base::Feature kParentNodeReplaceChildren{
-    "ParentNodeReplaceChildren", base::FEATURE_ENABLED_BY_DEFAULT};
-
 // Enable browser-initiated dedicated worker script loading
 // (PlzDedicatedWorker). https://crbug.com/906991
 const base::Feature kPlzDedicatedWorker{"PlzDedicatedWorker",

third_party/blink/public/common/features.h

@@ -43,7 +43,6 @@ BLINK_COMMON_EXPORT extern const base::Feature kLayoutNGFieldset;
 BLINK_COMMON_EXPORT extern const base::Feature kLayoutNGTextControl;
 BLINK_COMMON_EXPORT extern const base::Feature kMixedContentAutoupgrade;
 BLINK_COMMON_EXPORT extern const base::Feature kNavigationPredictor;
-BLINK_COMMON_EXPORT extern const base::Feature kParentNodeReplaceChildren;
 BLINK_COMMON_EXPORT extern const base::Feature kPlzDedicatedWorker;
 BLINK_COMMON_EXPORT extern const base::Feature kPortals;
 BLINK_COMMON_EXPORT extern const base::Feature kPortalsCrossOrigin;

third_party/blink/renderer/core/dom/parent_node.idl

@@ -40,7 +40,7 @@
 
     [Unscopable, RaisesException, CEReactions] void prepend((Node or DOMString or TrustedScript)... nodes);
     [Unscopable, RaisesException, CEReactions] void append((Node or DOMString or TrustedScript)... nodes);
-    [RuntimeEnabled=ParentNodeReplaceChildren, Unscopable, RaisesException, CEReactions] void replaceChildren((Node or DOMString or TrustedScript)... nodes);
+    [Unscopable, RaisesException, CEReactions] void replaceChildren((Node or DOMString or TrustedScript)... nodes);
 
     // [Unscopable] Element? query(DOMString relativeSelectors);
     // [NewObject, Unscopable] Elements queryAll(DOMString relativeSelectors);

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -1468,10 +1468,6 @@
       name: "PaintUnderInvalidationChecking",
       settable_from_internals: true,
     },
-    {
-      name: "ParentNodeReplaceChildren",
-      status: "stable",
-    },
     {
       // This flag enables the Manifest parser to handle URL Protocols.
       name: "ParseUrlProtocolHandler",