Introduce firstEphemeralRangeOf().

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index 1d3f446d1e4acd57d7eb6a03c54d22d081d766d6..1b28d915accd712dc17dd20f4f1a735ae7394171 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -2356,8 +2356,9 @@ WebTextInputInfo WebViewImpl::textInputInfo()
     if (info.value.isEmpty())
         return info;
 
-    if (RefPtrWillBeRawPtr<Range> range = firstRangeOf(selection.selection())) {
-        PlainTextRange plainTextRange(PlainTextRange::create(*element, *range.get()));
+    EphemeralRange firstRange = firstEphemeralRangeOf(selection.selection());
+    if (firstRange.isNotNull()) {
+        PlainTextRange plainTextRange(PlainTextRange::create(*element, firstRange));
         if (plainTextRange.isNotNull()) {
             info.selectionStart = plainTextRange.start();
             info.selectionEnd = plainTextRange.end();