Replace WTF::emptyString{16Bit}() with a static global

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 50 matching lines @@
     arraysize(kInputTypeStringNameMap) ==
         static_cast<size_t>(InputEvent::InputType::NumberOfInputTypes),
     "must handle all InputEvent::InputType");
 
 String convertInputTypeToString(InputEvent::InputType inputType) {
   const auto& it =
       std::begin(kInputTypeStringNameMap) + static_cast<size_t>(inputType);
   if (it >= std::begin(kInputTypeStringNameMap) &&
       it < std::end(kInputTypeStringNameMap))
     return AtomicString(it->stringName);
-  return emptyString();
+  return emptyString;
 }
 
 InputEvent::InputType convertStringToInputType(const String& stringName) {
   // 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;
 }
@@ skipping 135 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 |getTargetRanges()|->|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