Introduce firstRangeOf() as replacement of VisibleSelection::firstRange()

Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 2352 matching lines @@
     if (!focused->editor().canEdit())
         return info;
 
     // Emits an object replacement character for each replaced element so that
     // it is exposed to IME and thus could be deleted by IME on android.
     info.value = plainText(EphemeralRange::rangeOfContents(*element), TextIteratorEmitsObjectReplacementCharacter);
 
     if (info.value.isEmpty())
         return info;
 
-    if (RefPtrWillBeRawPtr<Range> range = selection.selection().firstRange()) {
+    if (RefPtrWillBeRawPtr<Range> range = firstRangeOf(selection.selection())) {
         PlainTextRange plainTextRange(PlainTextRange::create(*element, *range.get()));
         if (plainTextRange.isNotNull()) {
             info.selectionStart = plainTextRange.start();
             info.selectionEnd = plainTextRange.end();
         }
     }
 
     EphemeralRange range = focused->inputMethodController().compositionEphemeralRange();
     if (range.isNotNull()) {
         PlainTextRange plainTextRange(PlainTextRange::create(*element, range));
@@ skipping 2032 matching lines @@
     if (m_pageColorOverlay)
         m_pageColorOverlay->update();
     if (m_inspectorOverlay) {
         PageOverlay* inspectorPageOverlay = m_inspectorOverlay->pageOverlay();
         if (inspectorPageOverlay)
             inspectorPageOverlay->update();
     }
 }
 
 } // namespace blink