column-span:all in nested multicol requires re-insertion of fragmentainer groups.

third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.h

Index: third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.h b/third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.h
index 42acf664930161bcd7cb0aee5fa7bdd5caddfc30..8eb73a60fe7baf9d9354326d9bd738207ce142a9 100644
--- a/third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.h
+++ b/third_party/WebKit/Source/core/layout/LayoutMultiColumnFlowThread.h
@@ -35,8 +35,6 @@ namespace blink {
 class LayoutMultiColumnSet;
 class LayoutMultiColumnSpannerPlaceholder;
 
-enum BalancedColumnHeightCalculation { GuessFromFlowThreadPortion, StretchBySpaceShortage };
-
 // Flow thread implementation for CSS multicol. This will be inserted as an anonymous child block of
 // the actual multicol container (i.e. the LayoutBlockFlow whose style computes to non-auto
 // column-count and/or column-width). LayoutMultiColumnFlowThread is the heart of the multicol
@@ -179,8 +177,6 @@ public:
 
     void layoutColumns(SubtreeLayoutScope&);
 
-    bool isInInitialLayoutPass() const { return !m_inBalancingPass; }
-
     // Skip past a column spanner during flow thread layout. Spanners are not laid out inside the
     // flow thread, since the flow thread is not in a spanner's containing block chain (since the
     // containing block is the multicol container).