Refactoring button field and its type (2nd try)

ui/events/blink/web_input_event_traits.cc

 // 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 "ui/events/blink/web_input_event_traits.h"
 
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
 
 using base::StringAppendF;
@@ skipping 17 matching lines @@
                 event.nativeKeyCode,
                 event.isSystemKey,
                 reinterpret_cast<const char*>(event.text),
                 reinterpret_cast<const char*>(event.unmodifiedText));
 }
 
 void ApppendEventDetails(const WebMouseEvent& event, std::string* result) {
   StringAppendF(result,
                 "{\n Button: %d\n Pos: (%d, %d)\n WindowPos: (%d, %d)\n"
                 " GlobalPos: (%d, %d)\n Movement: (%d, %d)\n Clicks: %d\n}",
-                event.button,
+                static_cast<int>(event.button),
                 event.x,
                 event.y,
                 event.windowX,
                 event.windowY,
                 event.globalX,
                 event.globalY,
                 event.movementX,
                 event.movementY,
                 event.clickCount);
 }
@@ skipping 246 matching lines @@
 
 uint32_t WebInputEventTraits::GetUniqueTouchEventId(
     const WebInputEvent& event) {
   if (WebInputEvent::isTouchEventType(event.type)) {
     return static_cast<const WebTouchEvent&>(event).uniqueTouchEventId;
   }
   return 0U;
 }
 
 }  // namespace ui