[InputEvent] Change |getTargetRanges()| to return current selection by default

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 803 matching lines @@
   do {
     if (!setSelectionOffsets(PlainTextRange(
             std::max(static_cast<int>(selectionOffsets.start()) - before, 0),
             selectionOffsets.end() + after)))
       return;
     if (before == 0)
       break;
     ++before;
   } while (frame().selection().start() == frame().selection().end() &&
            before <= static_cast<int>(selectionOffsets.start()));
-  Range* const range = firstRangeOf(frame().selection().selection());
   // TODO(chongz): Find a way to distinguish Forward and Backward.
-  dispatchBeforeInputEditorCommand(document().focusedElement(),
-                                   InputEvent::InputType::DeleteContentBackward,
-                                   new RangeVector(1, range));
+  Node* target = document().focusedElement();
+  if (target) {
+    dispatchBeforeInputEditorCommand(
+        target, InputEvent::InputType::DeleteContentBackward,
+        targetRangesForInputEvent(*target));
+  }
   TypingCommand::deleteSelection(document());
 }
 
 // TODO(yabinh): We should reduce the number of selectionchange events.
 void InputMethodController::deleteSurroundingText(int before, int after) {
   if (!editor().canEdit())
     return;
   const PlainTextRange selectionOffsets(getSelectionOffsets());
   if (selectionOffsets.isNull())
     return;
@@ skipping 270 matching lines @@
   frame().chromeClient().resetInputMethod();
 }
 
 DEFINE_TRACE(InputMethodController) {
   visitor->trace(m_frame);
   visitor->trace(m_compositionRange);
   SynchronousMutationObserver::trace(visitor);
 }
 
 }  // namespace blink