web: Use publicPath() instead of ruffleRuntimePath

Similarly to how selfhosted currently does.

web/packages/core/src/globals.d.ts

@@ -1,9 +1,7 @@
 /* eslint @typescript-eslint/naming-convention:off */
 
 declare let __webpack_public_path__: string;
-declare let ruffleRuntimePath: string;
 
 interface Error {
-    ruffleIsExtension?: boolean;
     ruffleIndexError?: number;
 }

web/packages/core/src/load-ruffle.ts

@@ -22,36 +22,13 @@ async function fetchRuffle(): Promise<{ new (...args: any[]): Ruffle }> {
     // libraries, if needed.
     setPolyfillsOnLoad();
 
-    let isExtension = true;
-
-    try {
-        // If ruffleRuntimePath is defined then we are executing inside the extension
-        // closure. In that case, we configure our local Webpack instance.
-        __webpack_public_path__ = ruffleRuntimePath + "dist/";
-    } catch (e) {
-        // Checking an undefined closure variable usually throws ReferenceError,
-        // so we need to catch it here and continue onward.
-        if (!(e instanceof ReferenceError)) {
-            throw e;
-        }
-        isExtension = false;
-    }
-
-    // We currently assume that if we are not executing inside the extension,
-    // then we can use webpack to get Ruffle.
-
-    try {
-        // wasm files are set to use file-loader,
-        // so this package will resolve to the URL of the wasm file.
-        const ruffleWasm = await import(
-            /* webpackMode: "eager" */
-            "../pkg/ruffle_web_bg.wasm"
-        );
-        await init(ruffleWasm.default);
-    } catch (e) {
-        e.ruffleIsExtension = isExtension;
-        throw e;
-    }
+    // wasm files are set to use file-loader,
+    // so this package will resolve to the URL of the wasm file.
+    const ruffleWasm = await import(
+        /* webpackMode: "eager" */
+        "../pkg/ruffle_web_bg.wasm"
+    );
+    await init(ruffleWasm.default);
 
     return Ruffle;
 }

web/packages/core/src/ruffle-player.ts

@@ -346,7 +346,7 @@ export class RufflePlayer extends HTMLElement {
             // Serious duck typing. In error conditions, let's not make assumptions.
             if (window.location.protocol === "file:") {
                 e.ruffleIndexError = PanicError.FileProtocol;
-            } else if (!e.ruffleIsExtension) {
+            } else {
                 e.ruffleIndexError = PanicError.WasmNotFound;
                 const message = String(e.message).toLowerCase();
                 if (message.includes("mime")) {

web/packages/extension/.eslintrc.json

@@ -4,6 +4,7 @@
         "webextensions": true
     },
     "globals": {
+        "__webpack_public_path__": true,
         "obfuscatedEventPrefix": true
     }
 }

web/packages/extension/js/index.js

@@ -1,10 +1,11 @@
-import { PublicAPI, SourceAPI } from "ruffle-core";
+import { PublicAPI, SourceAPI, publicPath } from "ruffle-core";
 
 window.RufflePlayer = PublicAPI.negotiate(
     window.RufflePlayer,
     "extension",
     new SourceAPI("extension")
 );
+__webpack_public_path__ = publicPath(window.RufflePlayer.config, "extension");
 
 if (obfuscatedEventPrefix) {
     document.addEventListener(obfuscatedEventPrefix + "_request", function (e) {

web/packages/extension/js/lv0.js

@@ -154,9 +154,7 @@ getSyncStorage(["ruffleEnable", "ignoreOptout"], function (data) {
             let ruffleSrcResp = await fetch(extPath + "dist/ruffle.js");
             if (ruffleSrcResp.ok) {
                 let ruffleSource =
-                    '(function () { var ruffleRuntimePath = "' +
-                    extPath +
-                    '";\nvar obfuscatedEventPrefix = "' +
+                    '(function () { var obfuscatedEventPrefix = "' +
                     obfuscatedEventPrefix +
                     '";\n' +
                     (await ruffleSrcResp.text()) +