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 1b0a2ca1fc2354cfcd3ecdb3e3e4cd4c6561a41a..13ef51ed1feaee06ff70402e5e3686c3058cd041 100644
--- a/third_party/WebKit/Source/core/page/Page.h
+++ b/third_party/WebKit/Source/core/page/Page.h
@@ -200,16 +200,6 @@ public:
     bool isPainting() const { return m_isPainting; }
 #endif
 
-    class CORE_EXPORT MultisamplingChangedObserver : public GarbageCollectedMixin {
-    public:
-        virtual void multisamplingChanged(bool) = 0;
-    };
-
-    void addMultisamplingChangedObserver(MultisamplingChangedObserver*);
-#if !ENABLE(OILPAN)
-    void removeMultisamplingChangedObserver(MultisamplingChangedObserver*);
-#endif
-
     void didCommitLoad(LocalFrame*);
 
     void acceptLanguagesChanged();
@@ -287,8 +277,6 @@ private:
     bool m_isPainting;
 #endif
 
-    HeapHashSet<WeakMember<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.
     Member<FrameHost> m_frameHost;