Remove CSS regions support, keeping a bare minimum to support "region-based" multicol.

Source/core/rendering/RenderInline.cpp

Index: Source/core/rendering/RenderInline.cpp
diff --git a/Source/core/rendering/RenderInline.cpp b/Source/core/rendering/RenderInline.cpp
index 280a5a89f94ad814b2969eb38bd2fffb49cd4184..90a4c32e72260d9ed6200064085d939d149ce855 100644
--- a/Source/core/rendering/RenderInline.cpp
+++ b/Source/core/rendering/RenderInline.cpp
@@ -210,14 +210,12 @@ void RenderInline::updateAlwaysCreateLineBoxes(bool fullLayout)
     RenderStyle* parentStyle = parent()->style();
     RenderInline* parentRenderInline = parent()->isRenderInline() ? toRenderInline(parent()) : 0;
     bool checkFonts = document().inNoQuirksMode();
-    RenderFlowThread* flowThread = flowThreadContainingBlock();
     bool alwaysCreateLineBoxes = (parentRenderInline && parentRenderInline->alwaysCreateLineBoxes())
         || (parentRenderInline && parentStyle->verticalAlign() != BASELINE)
         || style()->verticalAlign() != BASELINE
         || style()->textEmphasisMark() != TextEmphasisMarkNone
         || (checkFonts && (!parentStyle->font().fontMetrics().hasIdenticalAscentDescentAndLineGap(style()->font().fontMetrics())
-        || parentStyle->lineHeight() != style()->lineHeight()))
-        || (flowThread && flowThread->hasRegionsWithStyling());
+        || parentStyle->lineHeight() != style()->lineHeight()));
 
     if (!alwaysCreateLineBoxes && checkFonts && document().styleEngine()->usesFirstLineRules()) {
         // Have to check the first line style as well.