[WIN] Fix build error of rebase: process_singleton_win
[WIN] Fix build error of rebase: process_singleton_win

error was 'g_browser_process is undefined' and we don't use it
in our code path

littlstar/chromium.src,ondra-novak/chromium.src,patrickm/chromium.src,littlstar/chromium.src,ondra-novak/chromium.src,littlstar/chromium.src,patrickm/chromium.src,patrickm/chromium.src,ondra-novak/chromium.src,patrickm/chromium.src,patrickm/chromium.src,littlstar/chromium.src,ondra-novak/chromium.src,littlstar/chromium.src,patrickm/chromium.src,ondra-novak/chromium.src,patrickm/chromium.src,ondra-novak/chromium.src,ondra-novak/chromium.src,littlstar/chromium.src,ondra-novak/chromium.src,ondra-novak/chromium.src,patrickm/chromium.src,littlstar/chromium.src,patrickm/chromium.src,littlstar/chromium.src