clang/win: Enable -Wswitch.

content/child/npapi/webplugin_delegate_impl_win.cc

Index: content/child/npapi/webplugin_delegate_impl_win.cc
diff --git a/content/child/npapi/webplugin_delegate_impl_win.cc b/content/child/npapi/webplugin_delegate_impl_win.cc
index 7a8ae8e3475cf4a0d4104169f1ce393a6c6e59a8..d64af01c4fdb989cbb2ff0049d7983a3bedfeae9 100644
--- a/content/child/npapi/webplugin_delegate_impl_win.cc
+++ b/content/child/npapi/webplugin_delegate_impl_win.cc
@@ -1092,8 +1092,8 @@ bool WebPluginDelegateImpl::PlatformSetPluginHasFocus(bool focused) {
 
 static bool NPEventFromWebMouseEvent(const WebMouseEvent& event,
                                      NPEvent* np_event) {
-  np_event->lParam = static_cast<uint32>(MAKELPARAM(event.windowX,
-                                                   event.windowY));
+  np_event->lParam =
+      static_cast<uint32>(MAKELPARAM(event.windowX, event.windowY));
   np_event->wParam = 0;
 
   if (event.modifiers & WebInputEvent::ControlKey)
@@ -1124,6 +1124,8 @@ static bool NPEventFromWebMouseEvent(const WebMouseEvent& event,
         case WebMouseEvent::ButtonRight:
           np_event->event = WM_RBUTTONDOWN;
           break;
+        case WebMouseEvent::ButtonNone:
+          break;
       }
       return true;
     case WebInputEvent::MouseUp:
@@ -1137,6 +1139,8 @@ static bool NPEventFromWebMouseEvent(const WebMouseEvent& event,
         case WebMouseEvent::ButtonRight:
           np_event->event = WM_RBUTTONUP;
           break;
+        case WebMouseEvent::ButtonNone:
+          break;
       }
       return true;
     default: