Make textDistance() in SelectionController not to create a redundant Range object

Source/core/editing/SelectionController.cpp

Index: Source/core/editing/SelectionController.cpp
diff --git a/Source/core/editing/SelectionController.cpp b/Source/core/editing/SelectionController.cpp
index 2c31da36b6a9d78cd7c935ac67269609d39bb44a..f7d2cdf40ba118fa8b4d0a080f431992bdaa6519 100644
--- a/Source/core/editing/SelectionController.cpp
+++ b/Source/core/editing/SelectionController.cpp
@@ -240,8 +240,7 @@ bool SelectionController::handleMousePressEventTripleClick(const MouseEventWithH
 
 static int textDistance(const Position& start, const Position& end)
 {
-    RefPtrWillBeRawPtr<Range> range = Range::create(*start.document(), start, end);
-    return TextIterator::rangeLength(range->startPosition(), range->endPosition(), true);
+    return TextIterator::rangeLength(start, end, true);
 }
 
 bool SelectionController::handleMousePressEventSingleClick(const MouseEventWithHitTestResults& event)