Rename isBlock() to isEnclosingBlock() in EditingUtilities

Source/core/editing/commands/DeleteSelectionCommand.cpp

Index: Source/core/editing/commands/DeleteSelectionCommand.cpp
diff --git a/Source/core/editing/commands/DeleteSelectionCommand.cpp b/Source/core/editing/commands/DeleteSelectionCommand.cpp
index 8ef2336f6de00400be7e0936f215f5c67d468f7c..067aeae08e4d52e1881a9eb1fe03a706ffc82175 100644
--- a/Source/core/editing/commands/DeleteSelectionCommand.cpp
+++ b/Source/core/editing/commands/DeleteSelectionCommand.cpp
@@ -260,8 +260,8 @@ void DeleteSelectionCommand::initializePositionData()
     // like the one below, since editing functions should obviously accept editing positions.
     // FIXME: Passing false to enclosingNodeOfType tells it that it's OK to return a non-editable
     // node.  This was done to match existing behavior, but it seems wrong.
-    m_startBlock = enclosingNodeOfType(m_downstreamStart.parentAnchoredEquivalent(), &isBlock, CanCrossEditingBoundary);
-    m_endBlock = enclosingNodeOfType(m_upstreamEnd.parentAnchoredEquivalent(), &isBlock, CanCrossEditingBoundary);
+    m_startBlock = enclosingNodeOfType(m_downstreamStart.parentAnchoredEquivalent(), &isEnclosingBlock, CanCrossEditingBoundary);
+    m_endBlock = enclosingNodeOfType(m_upstreamEnd.parentAnchoredEquivalent(), &isEnclosingBlock, CanCrossEditingBoundary);
 }
 
 // We don't want to inherit style from an element which can't have contents.