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

ui/native_theme/native_theme_win.cc

Index: ui/native_theme/native_theme_win.cc
diff --git a/ui/native_theme/native_theme_win.cc b/ui/native_theme/native_theme_win.cc
index aee3c4625026f3fcc1a8743658f5a1ee378d3473..6c023882daf0c0eefe35edf4e38e7d6f6d904e79 100644
--- a/ui/native_theme/native_theme_win.cc
+++ b/ui/native_theme/native_theme_win.cc
@@ -295,8 +295,7 @@ void NativeThemeWin::Paint(SkCanvas* canvas,
 }
 
 NativeThemeWin::NativeThemeWin()
-    : theme_dll_(LoadLibrary(L"uxtheme.dll")),
-      draw_theme_(NULL),
+    : draw_theme_(NULL),
       draw_theme_ex_(NULL),
       get_theme_color_(NULL),
       get_theme_content_rect_(NULL),
@@ -306,6 +305,7 @@ NativeThemeWin::NativeThemeWin()
       set_theme_properties_(NULL),
       is_theme_active_(NULL),
       get_theme_int_(NULL),
+      theme_dll_(LoadLibrary(L"uxtheme.dll")),
       color_change_listener_(this),
       is_using_high_contrast_(false),
       is_using_high_contrast_valid_(false) {