replace COMPILE_ASSERT with static_assert in web/

Source/web/mac/WebScrollbarTheme.mm

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 22 matching lines @@
 
 #import <AppKit/AppKit.h>
 
 #include "platform/mac/NSScrollerImpDetails.h"
 #include "platform/scroll/ScrollbarThemeMacCommon.h"
 
 using namespace blink;
 
 namespace blink {
 
-COMPILE_ASSERT(ScrollerStyleLegacy == NSScrollerStyleLegacy, ScrollerStyle_Legacy_must_be_equal);
-COMPILE_ASSERT(ScrollerStyleOverlay == NSScrollerStyleOverlay, ScrollerStyle_Overlay_must_be_equal);
+static_assert(ScrollerStyleLegacy == NSScrollerStyleLegacy, "ScrollerStyleLegacy must match NSScrollerStyleLegacy");
+static_assert(ScrollerStyleOverlay == NSScrollerStyleOverlay, "ScrollerStyleOverlay must match NSScrollerStyleOverlay");
 
 void WebScrollbarTheme::updateScrollbars(
     float initialButtonDelay, float autoscrollButtonDelay,
     ScrollerStyle preferredScrollerStyle, bool redraw)
 {
     ScrollbarTheme* theme = ScrollbarTheme::theme();
     if (theme->isMockTheme())
         return;
 
     static_cast<ScrollbarThemeMacCommon*>(ScrollbarTheme::theme())->preferencesChanged(
         initialButtonDelay, autoscrollButtonDelay, preferredScrollerStyle, redraw);
 }
 
 } // namespace blink