Get rid of flat tree version of createVisibleSelection() taking two PositionInFlatTree

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

Index: third_party/WebKit/Source/core/editing/SelectionController.cpp
diff --git a/third_party/WebKit/Source/core/editing/SelectionController.cpp b/third_party/WebKit/Source/core/editing/SelectionController.cpp
index 7cadac5b0f79ad42fb52330e9cd4746ed0996b3a..f5dd0964b330e89978cd16084e9135bd700f1cbc 100644
--- a/third_party/WebKit/Source/core/editing/SelectionController.cpp
+++ b/third_party/WebKit/Source/core/editing/SelectionController.cpp
@@ -182,10 +182,11 @@ bool SelectionController::handleMousePressEventSingleClick(
         const PositionInFlatTree end = newSelection.end();
         int distanceToStart = textDistance(start, pos);
         int distanceToEnd = textDistance(pos, end);
-        if (distanceToStart <= distanceToEnd)
-          newSelection = createVisibleSelection(end, pos);
-        else
-          newSelection = createVisibleSelection(start, pos);
+        newSelection = createVisibleSelection(
+            SelectionInFlatTree::Builder()
+                .collapse(distanceToStart <= distanceToEnd ? end : start)
+                .extend(pos)
+                .build());
       }
     } else {
       newSelection.setExtent(pos);
@@ -443,7 +444,8 @@ void SelectionController::selectClosestMisspellingFromHitTestResult(
       Node* containerNode = markerPosition.computeContainerNode();
       const PositionInFlatTree start(containerNode, markers[0]->startOffset());
       const PositionInFlatTree end(containerNode, markers[0]->endOffset());
-      newSelection = createVisibleSelection(start, end);
+      newSelection = createVisibleSelection(
+          SelectionInFlatTree::Builder().collapse(start).extend(end).build());
     }
   }