Rename Toolkit's webextensions component directory to better reflect what it is.

toolkit/components/extensions/ext-c-backgroundPage.js

@@ -1,45 +0,0 @@
-"use strict";
-
-global.initializeBackgroundPage = (contentWindow) => {
-  // Override the `alert()` method inside background windows;
-  // we alias it to console.log().
-  // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1203394
-  let alertDisplayedWarning = false;
-  let alertOverwrite = text => {
-    if (!alertDisplayedWarning) {
-      require("devtools/client/framework/devtools-browser");
-
-      let hudservice = require("devtools/client/webconsole/hudservice");
-      hudservice.openBrowserConsoleOrFocus();
-
-      contentWindow.console.warn("alert() is not supported in background windows; please use console.log instead.");
-
-      alertDisplayedWarning = true;
-    }
-
-    contentWindow.console.log(text);
-  };
-  Cu.exportFunction(alertOverwrite, contentWindow, {defineAs: "alert"});
-};
-
-extensions.registerSchemaAPI("extension", "addon_child", context => {
-  function getBackgroundPage() {
-    for (let view of context.extension.views) {
-      if (view.viewType == "background" && context.principal.subsumes(view.principal)) {
-        return view.contentWindow;
-      }
-    }
-    return null;
-  }
-  return {
-    extension: {
-      getBackgroundPage,
-    },
-
-    runtime: {
-      getBackgroundPage() {
-        return context.cloneScope.Promise.resolve(getBackgroundPage());
-      },
-    },
-  };
-});