Remove the MSAA WebSetting, which is not read or used.

third_party/WebKit/Source/core/page/Page.h

Index: third_party/WebKit/Source/core/page/Page.h
diff --git a/third_party/WebKit/Source/core/page/Page.h b/third_party/WebKit/Source/core/page/Page.h
index c9201549e4b8ec0514ccc16e29f0c537e518fa61..013ef25ea3d585771a231b3db1f47d8c5644df07 100644
--- a/third_party/WebKit/Source/core/page/Page.h
+++ b/third_party/WebKit/Source/core/page/Page.h
@@ -201,16 +201,6 @@ public:
     bool isPainting() const { return m_isPainting; }
 #endif
 
-    class CORE_EXPORT MultisamplingChangedObserver : public WillBeGarbageCollectedMixin {
-    public:
-        virtual void multisamplingChanged(bool) = 0;
-    };
-
-    void addMultisamplingChangedObserver(MultisamplingChangedObserver*);
-#if !ENABLE(OILPAN)
-    void removeMultisamplingChangedObserver(MultisamplingChangedObserver*);
-#endif
-
     void didCommitLoad(LocalFrame*);
 
     void acceptLanguagesChanged();
@@ -288,8 +278,6 @@ private:
     bool m_isPainting;
 #endif
 
-    WillBeHeapHashSet<RawPtrWillBeWeakMember<MultisamplingChangedObserver>> m_multisamplingChangedObservers;
-
     // A pointer to all the interfaces provided to in-process Frames for this Page.
     // FIXME: Most of the members of Page should move onto FrameHost.
     OwnPtrWillBeMember<FrameHost> m_frameHost;