Apply OwnPtr|PassOwnPtr to member variables and arguments in ContextFeatures.

Source/web/WebViewImpl.h

Index: Source/web/WebViewImpl.h
diff --git a/Source/web/WebViewImpl.h b/Source/web/WebViewImpl.h
index 0bb024f85dba1430cde79ed6d563c8ba6b540c7d..08802c69012230e4dc43bba2bcaef27b0f7f1bef 100644
--- a/Source/web/WebViewImpl.h
+++ b/Source/web/WebViewImpl.h
@@ -692,9 +692,6 @@ private:
     // current drop target in this WebView (the drop target can accept the drop).
     WebDragOperation m_dragOperation;
 
-    // Context-based feature switches.
-    OwnPtr<ContextFeaturesClientImpl> m_featureSwitchClient;
-
     // The popup associated with a select element.
     RefPtr<PopupContainer> m_selectPopup;
 
@@ -739,7 +736,6 @@ private:
 
     UserMediaClientImpl m_userMediaClientImpl;
     MediaKeysClientImpl m_mediaKeysClientImpl;
-    OwnPtr<MIDIClientProxy> m_midiClientProxy;
     OwnPtr<WebActiveGestureAnimation> m_gestureAnimation;
     WebPoint m_positionOnFlingStart;
     WebPoint m_globalPositionOnFlingStart;