Removing canvas rendering mode switching feature

third_party/WebKit/Source/core/html/canvas/CanvasRenderingContext.h

Index: third_party/WebKit/Source/core/html/canvas/CanvasRenderingContext.h
diff --git a/third_party/WebKit/Source/core/html/canvas/CanvasRenderingContext.h b/third_party/WebKit/Source/core/html/canvas/CanvasRenderingContext.h
index 31bf811d8207e5c3f190d043e039b3da7d2f2cbe..b492412a776e791d31e02f3ba75028f7691abcb3 100644
--- a/third_party/WebKit/Source/core/html/canvas/CanvasRenderingContext.h
+++ b/third_party/WebKit/Source/core/html/canvas/CanvasRenderingContext.h
@@ -162,7 +162,6 @@ class CORE_EXPORT CanvasRenderingContext
     return HitTestCanvasResult::Create(String(), nullptr);
   }
   virtual String GetIdFromControl(const Element* element) { return String(); }
-  virtual bool IsAccelerationOptimalForCanvasContent() const { return true; }
   virtual void ResetUsageTracking(){};
 
   // WebGL-specific interface