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

third_party/WebKit/Source/core/html/track/AutomaticTrackSelection.cpp

 // Copyright 2015 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/html/track/AutomaticTrackSelection.h"
 
 #include "core/html/track/TextTrack.h"
 #include "core/html/track/TextTrackList.h"
 #include "platform/Language.h"
 
@@ skipping 57 matching lines @@
   DCHECK(group.tracks.size());
 
   // First, find the track in the group that should be enabled (if any).
   HeapVector<Member<TextTrack>> currentlyEnabledTracks;
   TextTrack* trackToEnable = nullptr;
   TextTrack* defaultTrack = nullptr;
   TextTrack* preferredTrack = nullptr;
   TextTrack* fallbackTrack = nullptr;
   int highestTrackScore = 0;
 
-  for (size_t i = 0; i < group.tracks.size(); ++i) {
-    TextTrack* textTrack = group.tracks[i];
-
+  for (const auto& textTrack : group.tracks) {
     if (m_configuration.disableCurrentlyEnabledTracks &&
         textTrack->mode() == TextTrack::showingKeyword())
       currentlyEnabledTracks.append(textTrack);
 
     int trackScore = textTrackSelectionScore(*textTrack);
 
     if (textTrack->kind() == preferredTrackKind())
       trackScore += 1;
     if (trackScore) {
       // * If the text track kind is subtitles or captions and the user has
@@ skipping 29 matching lines @@
 
   if (!trackToEnable && m_configuration.forceEnableSubtitleOrCaptionTrack &&
       group.kind == TrackGroup::CaptionsAndSubtitles) {
     if (fallbackTrack)
       trackToEnable = fallbackTrack;
     else
       trackToEnable = group.tracks[0];
   }
 
   if (currentlyEnabledTracks.size()) {
-    for (size_t i = 0; i < currentlyEnabledTracks.size(); ++i) {
-      TextTrack* textTrack = currentlyEnabledTracks[i];
+    for (const auto& textTrack : currentlyEnabledTracks) {
       if (textTrack != trackToEnable)
         textTrack->setMode(TextTrack::disabledKeyword());
     }
   }
 
   if (trackToEnable)
     trackToEnable->setMode(TextTrack::showingKeyword());
 }
 
 void AutomaticTrackSelection::enableDefaultMetadataTextTracks(
@@ skipping 65 matching lines @@
     performAutomaticTextTrackSelection(captionAndSubtitleTracks);
   if (descriptionTracks.tracks.size())
     performAutomaticTextTrackSelection(descriptionTracks);
   if (chapterTracks.tracks.size())
     performAutomaticTextTrackSelection(chapterTracks);
   if (metadataTracks.tracks.size())
     enableDefaultMetadataTextTracks(metadataTracks);
 }
 
 }  // namespace blink