Update operator<<(SelectionState)

third_party/WebKit/Source/core/layout/api/SelectionState.cpp

 // Copyright 2017 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/layout/api/SelectionState.h"
 
 #include "platform/wtf/Assertions.h"
 
 namespace blink {
 
 std::ostream& operator<<(std::ostream& out, const SelectionState state) {
   switch (state) {
     case SelectionState::kNone:
       return out << "None";
     case SelectionState::kStart:
       return out << "Start";
     case SelectionState::kInside:
       return out << "Inside";
     case SelectionState::kEnd:
       return out << "End";
     case SelectionState::kStartAndEnd:
-      return out << "Both";
+      return out << "StartAndEnd";
   }
   NOTREACHED();
   return out;
 }
 
 }  // namespace blink