browser(firefox): roll Firefox to beta Oct 7, 2020 (#4087)

References #3995

Author: aslushnikov

browser_patches/firefox/BUILD_NUMBER

@@ -1,2 +1,2 @@
-1186
-Changed: [email protected] Wed Oct  7 09:26:45 PDT 2020
+1187
+Changed: [email protected] Wed Oct  7 13:30:11 PDT 2020

browser_patches/firefox/UPSTREAM_CONFIG.sh

@@ -1,3 +1,3 @@
 REMOTE_URL="https://github.com/mozilla/gecko-dev"
 BASE_BRANCH="beta"
-BASE_REVISION="38fc9ead5276fa81fb9bd49baf1a51e00683313c"
+BASE_REVISION="391a8785b29837607f7402a02cfad65e7f04eb89"

browser_patches/firefox/juggler/content/Runtime.js

@@ -167,7 +167,7 @@ class Runtime {
     const consoleObserver = ({wrappedJSObject}, topic, data) => {
       const executionContext = Array.from(this._executionContexts.values()).find(context => {
         const domWindow = context._domWindow;
-        return domWindow && domWindow.windowUtils.currentInnerWindowID === wrappedJSObject.innerID;
+        return domWindow && domWindow.windowGlobalChild.innerWindowId === wrappedJSObject.innerID;
       });
       if (!executionContext)
         return;