[New Multicolumn] Make fast/multicol/overflow-content.html pass in the new implementation.

Source/core/rendering/RenderBlock.cpp

Index: Source/core/rendering/RenderBlock.cpp
diff --git a/Source/core/rendering/RenderBlock.cpp b/Source/core/rendering/RenderBlock.cpp
index 66e6126d4009e68919bbc0b2771651602a68ec54..69aca9d70c5b4ed6257f2ff4a762668acb0ab005 100644
--- a/Source/core/rendering/RenderBlock.cpp
+++ b/Source/core/rendering/RenderBlock.cpp
@@ -1530,11 +1530,6 @@ bool RenderBlock::simplifiedLayout()
         if (needsSimplifiedNormalFlowLayout())
             simplifiedNormalFlowLayout();
 
-        // Make sure a forced break is applied after the content if we are a flow thread in a simplified layout.
-        // This ensures the size information is correctly computed for the last auto-height region receiving content.
-        if (isRenderFlowThread())
-            toRenderFlowThread(this)->applyBreakAfterContent(clientLogicalBottom());

[Julien - ping for review, 2014/05/07 01:01:11]

Shouldn't we call recalculateColumnHeight as our height could have changed (due
to children changing size)?

-
         // Lay out our positioned objects if our positioned child bit is set.
         // Also, if an absolute position element inside a relative positioned container moves, and the absolute element has a fixed position
         // child, neither the fixed element nor its container learn of the movement since posChildNeedsLayout() is only marked as far as the