Prune CreateVisiblePositionDeprecated from SurroundingText-related callers

third_party/WebKit/Source/core/editing/SurroundingText.cpp

Index: third_party/WebKit/Source/core/editing/SurroundingText.cpp
diff --git a/third_party/WebKit/Source/core/editing/SurroundingText.cpp b/third_party/WebKit/Source/core/editing/SurroundingText.cpp
index bb77ee83656705c66d6993fcf8617f0ec3811272..3a0316e13f2b17747ccb16faf7b9bb6f06fe2eac 100644
--- a/third_party/WebKit/Source/core/editing/SurroundingText.cpp
+++ b/third_party/WebKit/Source/core/editing/SurroundingText.cpp
@@ -63,6 +63,7 @@ void SurroundingText::initialize(const Position& startPosition, const Position&
     // The position will have no document if it is null (as in no position).
     if (!document || !document->documentElement())
         return;
+    DCHECK(!document->needsLayoutTreeUpdate());
 
     // The forward range starts at the selection end and ends at the document's
     // end. It will then be updated to only contain the text in the text in the