Revert 105784 - Merge 104121 - Source/WebCore: Crash in RenderRegion::getRegionRangeForBox.

Source/WebCore/rendering/RenderBlock.cpp

Index: Source/WebCore/rendering/RenderBlock.cpp
===================================================================
--- Source/WebCore/rendering/RenderBlock.cpp	(revision 105814)
+++ Source/WebCore/rendering/RenderBlock.cpp	(working copy)
@@ -6618,7 +6618,7 @@
         return 0;
 
     RenderFlowThread* flowThread = enclosingRenderFlowThread();
-    if (!flowThread || !flowThread->hasValidRegionInfo())
+    if (!flowThread || !flowThread->hasValidRegions())
         return 0;
 
     return flowThread->renderRegionForLine(offsetFromLogicalTopOfFirstPage() + blockOffset, true);
@@ -6639,7 +6639,7 @@
         return false;
     
     RenderFlowThread* flowThread = enclosingRenderFlowThread();
-    if (!flowThread || !flowThread->hasValidRegionInfo())
+    if (!flowThread || !flowThread->hasValidRegions())
         return 0;
     
     return flowThread->logicalWidthChangedInRegions(this, offsetFromLogicalTopOfFirstPage());