Drop document.createEvent support for things still behind a flag

third_party/WebKit/Source/core/events/InputEvent.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/events/InputEvent.h"
 
 #include "core/dom/Range.h"
 #include "core/events/EventDispatcher.h"
 #include "public/platform/WebEditingCommandType.h"
 
@@ skipping 67 matching lines @@
     // TODO(chongz): Use binary search if the map goes larger.
     for (const auto& entry : kInputTypeStringNameMap) {
         if (stringName == entry.stringName)
             return entry.inputType;
     }
     return InputEvent::InputType::None;
 }
 
 } // anonymous namespace
 
-InputEvent::InputEvent()
-{
-}
-
 InputEvent::InputEvent(const AtomicString& type, const InputEventInit& initializer)
     : UIEvent(type, initializer)
 {
     // TODO(ojan): We should find a way to prevent conversion like String->enum->String just in order to use initializer.
     // See InputEvent::createBeforeInput() for the first conversion.
     if (initializer.hasInputType())
         m_inputType = convertStringToInputType(initializer.inputType());
     if (initializer.hasData())
         m_data = initializer.data();
     if (initializer.hasIsComposing())
@@ skipping 96 matching lines @@
     //   3. We don't want authors to hold live |Range| indefinitely by holding |InputEvent|, so we
     //      clear them after dispatch.
     // Authors should explicitly call |getRanges()|->|toRange()| if they want to keep a copy of |Range|.
     // See Editing TF meeting notes:
     // https://docs.google.com/document/d/1hCj6QX77NYIVY0RWrMHT1Yra6t8_Qu8PopaWLG0AM58/edit?usp=sharing
     event().m_ranges.clear();
     return result;
 }
 
 } // namespace blink