Make DisplayItemClient an interface

third_party/WebKit/Source/platform/graphics/paint/CompositingDisplayItem.h

Index: third_party/WebKit/Source/platform/graphics/paint/CompositingDisplayItem.h
diff --git a/third_party/WebKit/Source/platform/graphics/paint/CompositingDisplayItem.h b/third_party/WebKit/Source/platform/graphics/paint/CompositingDisplayItem.h
index 2763f8fe1416a91dbe8efe862b34f53bee648199..1e444fcbc83bd3a92956863eafd2d1c16f95679e 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/CompositingDisplayItem.h
+++ b/third_party/WebKit/Source/platform/graphics/paint/CompositingDisplayItem.h
@@ -18,7 +18,7 @@ namespace blink {
 
 class PLATFORM_EXPORT BeginCompositingDisplayItem final : public PairedBeginDisplayItem {
 public:
-    BeginCompositingDisplayItem(const DisplayItemClientWrapper& client, const SkXfermode::Mode xferMode, const float opacity, const FloatRect* bounds, ColorFilter colorFilter = ColorFilterNone)
+    BeginCompositingDisplayItem(const DisplayItemClient& client, const SkXfermode::Mode xferMode, const float opacity, const FloatRect* bounds, ColorFilter colorFilter = ColorFilterNone)
         : PairedBeginDisplayItem(client, BeginCompositing, sizeof(*this))
         , m_xferMode(xferMode)
         , m_opacity(opacity)
@@ -57,7 +57,7 @@ private:
 
 class PLATFORM_EXPORT EndCompositingDisplayItem final : public PairedEndDisplayItem {
 public:
-    EndCompositingDisplayItem(const DisplayItemClientWrapper& client)
+    EndCompositingDisplayItem(const DisplayItemClient& client)
         : PairedEndDisplayItem(client, EndCompositing, sizeof(*this)) { }
 
     void replay(GraphicsContext&) const override;