Enable WebVTT regions for runtime testing, updated tests and minor fixes

Source/core/html/track/TextTrackRegion.h

Index: Source/core/html/track/TextTrackRegion.h
diff --git a/Source/core/html/track/TextTrackRegion.h b/Source/core/html/track/TextTrackRegion.h
index 5760063252c793bc538df649a86a903eccd3d8ec..fbff66a114510f3e1c685ed38a1e120bd7ea72d9 100644
--- a/Source/core/html/track/TextTrackRegion.h
+++ b/Source/core/html/track/TextTrackRegion.h
@@ -31,8 +31,6 @@
 #ifndef TextTrackRegion_h
 #define TextTrackRegion_h
 
-#if ENABLE(WEBVTT_REGIONS)
-
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/dom/Document.h"
 #include "core/html/track/TextTrack.h"
@@ -97,7 +95,7 @@ public:
 
 private:
     TextTrackRegion(ExecutionContext*);
-    Document* ownerDocument() { return toDocument(m_executionContext); }
+    Document* ownerDocument() { return toDocument(executionContext()); }
 
     void prepareRegionDisplayTree();
 
@@ -115,9 +113,7 @@ private:
         ViewportAnchor,
         Scroll
     };
-
     RegionSetting getSettingFromString(const String&);
-
     void parseSettingValue(RegionSetting, const String&);
     void parseSetting(const String&, unsigned*);
 
@@ -127,20 +123,16 @@ private:
 
     String m_id;
     String m_settings;
-
     double m_width;
     unsigned m_heightInLines;
-
     FloatPoint m_regionAnchor;
     FloatPoint m_viewportAnchor;
-
     bool m_scroll;
 
-    RefPtr<HTMLDivElement> m_regionDisplayTree;
-
     // The cue container is the container that is scrolled up to obtain the
     // effect of scrolling cues when this is enabled for the regions.
     RefPtr<HTMLDivElement> m_cueContainer;
+    RefPtr<HTMLDivElement> m_regionDisplayTree;
 
     // The member variable track can be a raw pointer as it will never
     // reference a destroyed TextTrack, as this member variable
@@ -160,6 +152,4 @@ private:
 };
 
 } // namespace WebCore
-
-#endif
 #endif