Bug 1718269 Renamed event that opens screenshots UI from the extension.r=emalysz

Differential Revision: https://phabricator.services.mozilla.com/D118855

browser/base/content/nsContextMenu.js

@@ -1292,7 +1292,7 @@ class nsContextMenu {
 
   takeScreenshot() {
     if (!SCREENSHOT_BROWSER_COMPONENT) {
-      Services.obs.notifyObservers(null, "menuitem-screenshot", true);
+      Services.obs.notifyObservers(null, "menuitem-screenshot-extension", true);
     }
   }
 

browser/components/customizableui/CustomizableWidgets.jsm

@@ -484,7 +484,7 @@ if (!screenshotsDisabled) {
     l10nId: "screenshot-toolbarbutton",
     onCommand(aEvent) {
       if (!SCREENSHOT_BROWSER_COMPONENT) {
-        Services.obs.notifyObservers(null, "menuitem-screenshot");
+        Services.obs.notifyObservers(null, "menuitem-screenshot-extension");
       }
     },
     onCreated(aNode) {

browser/extensions/screenshots/experiments/screenshots/api.js

@@ -6,7 +6,7 @@
 
 "use strict";
 
-const TOPIC = "menuitem-screenshot";
+const TOPIC = "menuitem-screenshot-extension";
 
 this.screenshots = class extends ExtensionAPI {
   getAPI(context) {