Removing patch preventing plugin metadata call to gstatic.com

This patch had been introduced as result of the following issue:

brave/brave-browser#1684

However, this method to fetch plugin metadata has since then been
deprecated, and with it, the methods being patched have been removed.

Chromium change:
https://chromium.googlesource.com/chromium/src/+/a1734d6df773d5984ebc2fb4a5e33ae85609ed97

commit a1734d6df773d5984ebc2fb4a5e33ae85609ed97
Author: Robert Sesek <[email protected]>
Date:   Wed Apr 20 19:09:31 2022 +0000

    Delete the PluginsResourceService and WebResourceService.

    The PluginsResourceService was used to fetch metadata about plugin
    security updates. But the relevant plugins are deprecated, so Chrome
    does not need to check for these updates. Nothing else uses
    WebResourceService, so it too is deleted.

    The also cleans up the PluginFinder class that used the
    PluginsResourceService.

    Bug: 1064647