alloy: Disable bfcache in M98 (see issue #3237)

This will be reverted if the bfcache issue is fixed before M98 becomes the
stable channel.

libcef/browser/alloy/alloy_browser_host_impl.cc

@@ -1463,7 +1463,8 @@ void AlloyBrowserHostImpl::ExitPictureInPicture() {
 }
 
 bool AlloyBrowserHostImpl::IsBackForwardCacheSupported() {
-  return true;
+  // Disabled due to issue #3237.
+  return false;
 }
 
 bool AlloyBrowserHostImpl::IsPrerender2Supported() {