Oilpan: fix build after r198661.

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 "config.h"
 #include "core/html/track/AutomaticTrackSelection.h"
 
 #include "core/html/track/TextTrack.h"
 #include "core/html/track/TextTrackList.h"
 #include "platform/Language.h"
@@ skipping 105 matching lines @@
             defaultTrack = textTrack;
         }
     }
 
     if (m_configuration.textTrackKindUserPreference != TextTrackKindUserPreference::Default)
         trackToEnable = preferredTrack;
 
     if (!trackToEnable && defaultTrack)
         trackToEnable = defaultTrack;
 
-    if (!trackToEnable && m_configuration.forceEnableSubtitleOrCaptionTrack && group.kind == TrackGroup::CaptionsAndSubtitles)
-        trackToEnable = fallbackTrack ? fallbackTrack : group.tracks[0];
+    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) {
             RefPtrWillBeRawPtr<TextTrack> textTrack = currentlyEnabledTracks[i];
             if (textTrack != trackToEnable)
                 textTrack->setMode(TextTrack::disabledKeyword());
         }
     }
 
     if (trackToEnable)
@@ skipping 67 matching lines @@
         performAutomaticTextTrackSelection(captionAndSubtitleTracks);
     if (descriptionTracks.tracks.size())
         performAutomaticTextTrackSelection(descriptionTracks);
     if (chapterTracks.tracks.size())
         performAutomaticTextTrackSelection(chapterTracks);
     if (metadataTracks.tracks.size())
         enableDefaultMetadataTextTracks(metadataTracks);
 }
 
 } // namespace blink