Prune ComputeVisibleSelectionInDOMTreeDeprecated from TargetRangesForInputEvent

This patch prunes a call site of the deprecated function to improve code
health.

BUG=698633
TEST=n/a; no behavioral change

Review-Url: https://codereview.chromium.org/2849573002
Cr-Commit-Position: refs/heads/master@{#467887}

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

@@ -2112,7 +2112,7 @@ const StaticRangeVector* TargetRangesForInputEvent(const Node& node) {
       FirstEphemeralRangeOf(node.GetDocument()
                                 .GetFrame()
                                 ->Selection()
-                                .ComputeVisibleSelectionInDOMTreeDeprecated());
+                                .ComputeVisibleSelectionInDOMTree());
   if (range.IsNull())
     return nullptr;
   return new StaticRangeVector(1, StaticRange::Create(range));