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

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

Index: third_party/WebKit/Source/core/editing/InputMethodController.cpp
diff --git a/third_party/WebKit/Source/core/editing/InputMethodController.cpp b/third_party/WebKit/Source/core/editing/InputMethodController.cpp
index dd5e4e66636284921fc638683c840c8320d37608..e0addcd8dfe251a68edb598967d706f96bbfed3f 100644
--- a/third_party/WebKit/Source/core/editing/InputMethodController.cpp
+++ b/third_party/WebKit/Source/core/editing/InputMethodController.cpp
@@ -821,11 +821,13 @@ void InputMethodController::extendSelectionAndDelete(int before, int after) {
     ++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());
 }