Remove FeaturePolicyFeature::kAccessibilityEvent

|FeaturePolicyFeature::kAccessibilityEvent| appears in
feature_policy_feature.mojom but is missing in
feature_policy_features.json5.

The original owner(dmazzoni@) who added the feature agreed
that it can be removed for now.

Change-Id: Ica187050353607e79e4b29027efc256f188b2e35
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2250340Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Commit-Queue: Charlie Hu <chenleihu@google.com>
Cr-Commit-Position: refs/heads/master@{#780027}

chrome/browser/accessibility/accessibility_permission_context.cc

@@ -7,10 +7,9 @@
 
 AccessibilityPermissionContext::AccessibilityPermissionContext(
     content::BrowserContext* browser_context)
-    : PermissionContextBase(
-          browser_context,
-          ContentSettingsType::ACCESSIBILITY_EVENTS,
-          blink::mojom::FeaturePolicyFeature::kAccessibilityEvents) {}
+    : PermissionContextBase(browser_context,
+                            ContentSettingsType::ACCESSIBILITY_EVENTS,
+                            blink::mojom::FeaturePolicyFeature::kNotFound) {}
 
 AccessibilityPermissionContext::~AccessibilityPermissionContext() = default;
 

third_party/blink/common/feature_policy/feature_policy.cc

@@ -384,8 +384,6 @@ const FeaturePolicy::FeatureList& FeaturePolicy::GetDefaultFeatureList() {
   static base::NoDestructor<FeatureList> default_feature_list(
       {{mojom::FeaturePolicyFeature::kAccelerometer,
         FeatureDefault(FeaturePolicy::FeatureDefault::EnableForSelf)},
-       {mojom::FeaturePolicyFeature::kAccessibilityEvents,
-        FeatureDefault(FeaturePolicy::FeatureDefault::EnableForSelf)},
        {mojom::FeaturePolicyFeature::kAmbientLightSensor,
         FeatureDefault(FeaturePolicy::FeatureDefault::EnableForSelf)},
        {mojom::FeaturePolicyFeature::kAutoplay,

third_party/blink/public/mojom/feature_policy/feature_policy_feature.mojom

@@ -37,8 +37,6 @@ enum FeaturePolicyFeature {
   kSyncXHR = 13,
   // Controls access to the WebUSB API.
   kUsb = 14,
-  // Controls access to AOM event listeners.
-  kAccessibilityEvents = 15,
   // The following features control access to the corresponding sensor classes.
   // Fusion sensor APIs (e.g. LinearAcceleration, OrientationSensor-based
   // classes)require all of the features that are inputs into that API to be