chore: address TODO for WebContents.prototype.setSize / reportRemovedAttribute removal (#14517)

* chore: remove WebContents.prototype.setSize

* chore: remove reportRemovedAttribute

* chore: remove unused fixtures

lib/renderer/web-view/web-view.js

@@ -16,13 +16,6 @@ const getNextId = function () {
   return ++nextId
 }
 
-// A list of removed attributes from 3.0.
-const removedAttributes = [
-  'autoresize',
-  'disableguestresize',
-  'guestinstance'
-]
-
 // Represents the internal state of the WebView node.
 class WebViewImpl {
   constructor (webviewNode) {
@@ -32,13 +25,6 @@ class WebViewImpl {
     this.beforeFirstNavigation = true
     this.hasFocus = false
 
-    // Check for removed attributes.
-    for (const attributeName of removedAttributes) {
-      if (this.webviewNode.hasAttribute(attributeName)) {
-        this.reportRemovedAttribute(attributeName)
-      }
-    }
-
     // on* Event handlers.
     this.on = {}
 
@@ -106,11 +92,6 @@ class WebViewImpl {
   // attribute, if necessary. See BrowserPlugin::UpdateDOMAttribute for more
   // details.
   handleWebviewAttributeMutation (attributeName, oldValue, newValue) {
-    if (removedAttributes.includes(attributeName)) {
-      this.reportRemovedAttribute(attributeName)
-      return
-    }
-
     if (!this.attributes[attributeName] || this.attributes[attributeName].ignoreMutation) {
       return
     }
@@ -215,12 +196,6 @@ class WebViewImpl {
     // even documented.
     this.resizeObserver = new ResizeObserver(this.onElementResize.bind(this)).observe(this.internalElement)
   }
-
-  // TODO(zcbenz): Remove the warning in 4.0.
-  reportRemovedAttribute (attributeName) {
-    console.error(`The "${attributeName}" attribute has been removed from the <webview> tag,`,
-                  'see https://github.com/electron/electron/issues/14120 for more.')
-  }
 }
 
 // Registers <webview> custom element.