Avoid WTF::Vector::at() and operator[] in core/events.

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

 /*
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 111 matching lines @@
 #else
        PlatformEvent::CtrlKey
 #endif
       },
       {"Fn", PlatformEvent::FnKey},
       {"CapsLock", PlatformEvent::CapsLockOn},
       {"ScrollLock", PlatformEvent::ScrollLockOn},
       {"NumLock", PlatformEvent::NumLockOn},
       {"Symbol", PlatformEvent::SymbolKey},
   };
-  for (size_t i = 0; i < WTF_ARRAY_LENGTH(kIdentifiers); ++i) {
-    if (keyIdentifier == kIdentifiers[i].identifier)
-      return m_modifiers & kIdentifiers[i].mask;
+  for (const auto& identifier : kIdentifiers) {
+    if (keyIdentifier == identifier.identifier)
+      return m_modifiers & identifier.mask;
   }
   return false;
 }
 
 void UIEventWithKeyState::initModifiers(bool ctrlKey,
                                         bool altKey,
                                         bool shiftKey,
                                         bool metaKey) {
   m_modifiers = 0;
   if (ctrlKey)
     m_modifiers |= PlatformEvent::CtrlKey;
   if (altKey)
     m_modifiers |= PlatformEvent::AltKey;
   if (shiftKey)
     m_modifiers |= PlatformEvent::ShiftKey;
   if (metaKey)
     m_modifiers |= PlatformEvent::MetaKey;
 }
 
 UIEventWithKeyState* findEventWithKeyState(Event* event) {
   for (Event* e = event; e; e = e->underlyingEvent())
     if (e->isKeyboardEvent() || e->isMouseEvent())
       return static_cast<UIEventWithKeyState*>(e);
   return nullptr;
 }
 
 }  // namespace blink