clang/win: Fix warnings to prepare for building without -Wno-reorder.

win8/metro_driver/metro_driver_win7.cc

Index: win8/metro_driver/metro_driver_win7.cc
diff --git a/win8/metro_driver/metro_driver_win7.cc b/win8/metro_driver/metro_driver_win7.cc
index 9c4b90d11c35203908c1f7f023596a8eb98dc4f8..3ace04caee0a06327e53b95281b2c12e2be42b5c 100644
--- a/win8/metro_driver/metro_driver_win7.cc
+++ b/win8/metro_driver/metro_driver_win7.cc
@@ -538,8 +538,7 @@ class CoreWindowEmulation
       public InputHandler {
  public:
   CoreWindowEmulation(winapp::Core::IFrameworkView* app_view)
-      : core_hwnd_(NULL),
-        mouse_moved_handler_(NULL),
+      : mouse_moved_handler_(NULL),
         mouse_capture_lost_handler_(NULL),
         mouse_pressed_handler_(NULL),
         mouse_released_handler_(NULL),
@@ -549,6 +548,7 @@ class CoreWindowEmulation
         key_down_handler_(NULL),
         key_up_handler_(NULL),
         character_received_handler_(NULL),
+        core_hwnd_(NULL),
         app_view_(app_view),
         window_activated_handler_(NULL) {
     dispatcher_ = mswr::Make<CoreDispatcherEmulation>(this);