Remove CSS_REGIONS compile flag from Blink.

Source/core/css/StyleBuilder.cpp

Index: Source/core/css/StyleBuilder.cpp
diff --git a/Source/core/css/StyleBuilder.cpp b/Source/core/css/StyleBuilder.cpp
index 020570872f00809d29a6134c6ad59c03d283dc91..757529920e0a64b811950b44fa94b82f72af4c8c 100644
--- a/Source/core/css/StyleBuilder.cpp
+++ b/Source/core/css/StyleBuilder.cpp
@@ -2191,10 +2191,8 @@ StyleBuilder::StyleBuilder()
     setPropertyHandler(CSSPropertyWebkitGridAutoFlow, ApplyPropertyDefault<GridAutoFlow, &RenderStyle::gridAutoFlow, GridAutoFlow, &RenderStyle::setGridAutoFlow, GridAutoFlow, &RenderStyle::initialGridAutoFlow>::createHandler());
     setPropertyHandler(CSSPropertyWebkitJustifyContent, ApplyPropertyDefault<EJustifyContent, &RenderStyle::justifyContent, EJustifyContent, &RenderStyle::setJustifyContent, EJustifyContent, &RenderStyle::initialJustifyContent>::createHandler());
     setPropertyHandler(CSSPropertyWebkitOrder, ApplyPropertyDefault<int, &RenderStyle::order, int, &RenderStyle::setOrder, int, &RenderStyle::initialOrder>::createHandler());
-#if ENABLE(CSS_REGIONS)
     setPropertyHandler(CSSPropertyWebkitFlowFrom, ApplyPropertyString<MapNoneToNull, &RenderStyle::regionThread, &RenderStyle::setRegionThread, &RenderStyle::initialRegionThread>::createHandler());
     setPropertyHandler(CSSPropertyWebkitFlowInto, ApplyPropertyString<MapNoneToNull, &RenderStyle::flowThread, &RenderStyle::setFlowThread, &RenderStyle::initialFlowThread>::createHandler());
-#endif
     setPropertyHandler(CSSPropertyWebkitFontKerning, ApplyPropertyFont<FontDescription::Kerning, &FontDescription::kerning, &FontDescription::setKerning, FontDescription::AutoKerning>::createHandler());
     setPropertyHandler(CSSPropertyWebkitFontSmoothing, ApplyPropertyFont<FontSmoothingMode, &FontDescription::fontSmoothing, &FontDescription::setFontSmoothing, AutoSmoothing>::createHandler());
     setPropertyHandler(CSSPropertyWebkitFontVariantLigatures, ApplyPropertyFontVariantLigatures::createHandler());
@@ -2237,12 +2235,10 @@ StyleBuilder::StyleBuilder()
     setPropertyHandler(CSSPropertyWebkitPerspectiveOriginX, ApplyPropertyLength<&RenderStyle::perspectiveOriginX, &RenderStyle::setPerspectiveOriginX, &RenderStyle::initialPerspectiveOriginX>::createHandler());
     setPropertyHandler(CSSPropertyWebkitPerspectiveOriginY, ApplyPropertyLength<&RenderStyle::perspectiveOriginY, &RenderStyle::setPerspectiveOriginY, &RenderStyle::initialPerspectiveOriginY>::createHandler());
     setPropertyHandler(CSSPropertyWebkitPrintColorAdjust, ApplyPropertyDefault<PrintColorAdjust, &RenderStyle::printColorAdjust, PrintColorAdjust, &RenderStyle::setPrintColorAdjust, PrintColorAdjust, &RenderStyle::initialPrintColorAdjust>::createHandler());
-#if ENABLE(CSS_REGIONS)
     setPropertyHandler(CSSPropertyWebkitRegionBreakAfter, ApplyPropertyDefault<EPageBreak, &RenderStyle::regionBreakAfter, EPageBreak, &RenderStyle::setRegionBreakAfter, EPageBreak, &RenderStyle::initialPageBreak>::createHandler());
     setPropertyHandler(CSSPropertyWebkitRegionBreakBefore, ApplyPropertyDefault<EPageBreak, &RenderStyle::regionBreakBefore, EPageBreak, &RenderStyle::setRegionBreakBefore, EPageBreak, &RenderStyle::initialPageBreak>::createHandler());
     setPropertyHandler(CSSPropertyWebkitRegionBreakInside, ApplyPropertyDefault<EPageBreak, &RenderStyle::regionBreakInside, EPageBreak, &RenderStyle::setRegionBreakInside, EPageBreak, &RenderStyle::initialPageBreak>::createHandler());
     setPropertyHandler(CSSPropertyWebkitRegionOverflow, ApplyPropertyDefault<RegionOverflow, &RenderStyle::regionOverflow, RegionOverflow, &RenderStyle::setRegionOverflow, RegionOverflow, &RenderStyle::initialRegionOverflow>::createHandler());
-#endif
     setPropertyHandler(CSSPropertyWebkitRtlOrdering, ApplyPropertyDefault<Order, &RenderStyle::rtlOrdering, Order, &RenderStyle::setRTLOrdering, Order, &RenderStyle::initialRTLOrdering>::createHandler());
     setPropertyHandler(CSSPropertyWebkitRubyPosition, ApplyPropertyDefault<RubyPosition, &RenderStyle::rubyPosition, RubyPosition, &RenderStyle::setRubyPosition, RubyPosition, &RenderStyle::initialRubyPosition>::createHandler());
     setPropertyHandler(CSSPropertyWebkitTextCombine, ApplyPropertyDefault<TextCombine, &RenderStyle::textCombine, TextCombine, &RenderStyle::setTextCombine, TextCombine, &RenderStyle::initialTextCombine>::createHandler());