code: void removeBrowserSession(BrowserSessionImpl browser)
      {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.entry(tc, "removeBrowserSession", browser);
  
          synchronized (_browsers)
          {
              _browsers.remove(browser);
          }
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.exit(tc, "removeBrowserSession");
      }
docs: This method simply removes a Browser Session from our list. It is generally
  called by the Browser Session as it is closing down.
  
  @param browser