Fix false negatives in system key events recognition

Source/web/WebInputEventFactoryMac.mm

Index: Source/web/WebInputEventFactoryMac.mm
diff --git a/Source/web/WebInputEventFactoryMac.mm b/Source/web/WebInputEventFactoryMac.mm
index a455bbab6e458acff8363ec5dee31b9d2fd6a135..7bca7e0ba799e1c8d9a087f47bd38f880383ea16 100644
--- a/Source/web/WebInputEventFactoryMac.mm
+++ b/Source/web/WebInputEventFactoryMac.mm
@@ -823,11 +823,16 @@ bool WebInputEventFactory::isSystemKeyEvent(const WebKeyboardEvent& event)
     // shouldn't be used by Blink to scroll the current page, because we want
     // to get that key back for it to do history navigation. Hence, the
     // corresponding situation on OS X is to set this for cmd key presses.
+
     // cmd-b and and cmd-i are system wide key bindings that OS X doesn't
     // handle for us, so the editor handles them.
-    return event.modifiers & WebInputEvent::MetaKey
-           && event.windowsKeyCode != VK_B
-           && event.windowsKeyCode != VK_I;
+    int modifiers = event.modifiers & WebInputEvent::InputModifiers;
+    if (modifiers == WebInputEvent::MetaKey && event.windowsKeyCode == VK_B)
+        return false;
+    if (modifiers == WebInputEvent::MetaKey && event.windowsKeyCode == VK_I)
+        return false;
+
+    return event.modifiers & WebInputEvent::MetaKey;
 }
 
 WebKeyboardEvent WebInputEventFactory::keyboardEvent(NSEvent* event)