Add guard64.dll to sandbox target DLL blacklist.

content/common/sandbox_win.cc

Index: content/common/sandbox_win.cc
diff --git a/content/common/sandbox_win.cc b/content/common/sandbox_win.cc
index ade30698c5b9a16b1fb07ba26cc0b45e008d218c..66a279ef9d17319fd6de314ba375ca4e17e0bfb9 100644
--- a/content/common/sandbox_win.cc
+++ b/content/common/sandbox_win.cc
@@ -77,6 +77,7 @@ const wchar_t* const kTroublesomeDlls[] = {
   L"esspd.dll",                   // Samsung Smart Security ESCORT.
   L"googledesktopnetwork3.dll",   // Google Desktop Search v5.
   L"fwhook.dll",                  // PC Tools Firewall Plus.
+  L"guard64.dll",                 // Comodo Internet Security x64.
   L"hookprocesscreation.dll",     // Blumentals Program protector.
   L"hookterminateapis.dll",       // Blumentals and Cyberprinter.
   L"hookprintapis.dll",           // Cyberprinter.