*** DO NOT LAND *** Attempt to understand Regions complexity

Source/core/core.gypi

Index: Source/core/core.gypi
diff --git a/Source/core/core.gypi b/Source/core/core.gypi
index 58b31f8495b9aa8249f85fa462fc89255108b397..a0c2f5f3ba24cf4cb030161229b8566ad2ac2f80 100644
--- a/Source/core/core.gypi
+++ b/Source/core/core.gypi
@@ -43,7 +43,6 @@
             'css/WebKitCSSFilterRule.idl',
             'css/WebKitCSSFilterValue.idl',
             'css/WebKitCSSMatrix.idl',
-            'css/WebKitCSSRegionRule.idl',
             'css/WebKitCSSTransformValue.idl',
             'dom/Attr.idl',
             'dom/CDATASection.idl',
@@ -86,8 +85,6 @@
             'dom/TouchList.idl',
             'dom/TreeWalker.idl',
             'dom/URL.idl',
-            'dom/WebKitNamedFlow.idl',
-            'dom/WebKitNamedFlowCollection.idl',
             'dom/shadow/ShadowRoot.idl',
             'events/AutocompleteErrorEvent.idl',
             'events/BeforeLoadEvent.idl',
@@ -700,8 +697,6 @@
             'css/CSSProperty.cpp',
             'css/CSSPropertySourceData.cpp',
             'css/CSSReflectValue.cpp',
-            'css/CSSRegionRule.cpp',
-            'css/CSSRegionRule.h',
             'css/CSSRule.cpp',
             'css/CSSRule.h',
             'css/CSSRuleList.cpp',
@@ -1384,8 +1379,6 @@
             'rendering/FixedTableLayout.h',
             'rendering/FloatingObjects.cpp',
             'rendering/FloatingObjects.h',
-            'rendering/FlowThreadController.cpp',
-            'rendering/FlowThreadController.h',
             'rendering/GraphicsContextAnnotator.cpp',
             'rendering/GraphicsContextAnnotator.h',
             'rendering/HitTestLocation.cpp',
@@ -1434,8 +1427,6 @@
             'rendering/RenderFileUploadControl.h',
             'rendering/RenderFlexibleBox.cpp',
             'rendering/RenderFlexibleBox.h',
-            'rendering/RenderFlowThread.cpp',
-            'rendering/RenderFlowThread.h',
             'rendering/RenderFrame.cpp',
             'rendering/RenderFrame.h',
             'rendering/RenderFrameSet.cpp',
@@ -1488,16 +1479,6 @@
             'rendering/RenderMenuList.h',
             'rendering/RenderMeter.cpp',
             'rendering/RenderMeter.h',
-            'rendering/RenderMultiColumnBlock.cpp',
-            'rendering/RenderMultiColumnBlock.h',
-            'rendering/RenderMultiColumnFlowThread.cpp',
-            'rendering/RenderMultiColumnFlowThread.h',
-            'rendering/RenderMultiColumnSet.cpp',
-            'rendering/RenderMultiColumnSet.h',
-            'rendering/RenderNamedFlowFragment.cpp',
-            'rendering/RenderNamedFlowFragment.h',
-            'rendering/RenderNamedFlowThread.cpp',
-            'rendering/RenderNamedFlowThread.h',
             'rendering/RenderObject.cpp',
             'rendering/RenderObjectChildList.cpp',
             'rendering/RenderPart.cpp',
@@ -1505,10 +1486,6 @@
             'rendering/RenderProgress.h',
             'rendering/RenderQuote.cpp',
             'rendering/RenderQuote.h',
-            'rendering/RenderRegion.cpp',
-            'rendering/RenderRegion.h',
-            'rendering/RenderRegionSet.cpp',
-            'rendering/RenderRegionSet.h',
             'rendering/RenderReplaced.cpp',
             'rendering/RenderReplica.cpp',
             'rendering/RenderReplica.h',
@@ -1906,8 +1883,6 @@
             'dom/DOMException.cpp',
             'dom/DOMException.h',
             'dom/DOMImplementation.cpp',
-            'dom/DOMNamedFlowCollection.cpp',
-            'dom/DOMNamedFlowCollection.h',
             'dom/DOMSettableTokenList.cpp',
             'dom/DOMSettableTokenList.h',
             'dom/DOMStringList.cpp',
@@ -1960,10 +1935,6 @@
             'dom/MutationObserverRegistration.h',
             'dom/MutationRecord.cpp',
             'dom/MutationRecord.h',
-            'dom/NamedFlow.cpp',
-            'dom/NamedFlow.h',
-            'dom/NamedFlowCollection.cpp',
-            'dom/NamedFlowCollection.h',
             'dom/NamedNodeMap.cpp',
             'dom/NamedNodesCollection.cpp',
             'dom/NamedNodesCollection.h',