Make DisplayItemClient an interface

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

Index: third_party/WebKit/Source/platform/graphics/paint/FilterDisplayItem.h
diff --git a/third_party/WebKit/Source/platform/graphics/paint/FilterDisplayItem.h b/third_party/WebKit/Source/platform/graphics/paint/FilterDisplayItem.h
index dd95a2d218be1dab42c5c4237e6792edd2cce1b4..9d4ce9566c6c9c3206c674cbb32a5da5f5c518e8 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/FilterDisplayItem.h
+++ b/third_party/WebKit/Source/platform/graphics/paint/FilterDisplayItem.h
@@ -18,7 +18,7 @@ namespace blink {
 
 class PLATFORM_EXPORT BeginFilterDisplayItem final : public PairedBeginDisplayItem {
 public:
-    BeginFilterDisplayItem(const DisplayItemClientWrapper& client, PassRefPtr<SkImageFilter> imageFilter, const FloatRect& bounds, PassOwnPtr<WebFilterOperations> filterOperations = nullptr)
+    BeginFilterDisplayItem(const DisplayItemClient& client, PassRefPtr<SkImageFilter> imageFilter, const FloatRect& bounds, PassOwnPtr<WebFilterOperations> filterOperations = nullptr)
         : PairedBeginDisplayItem(client, BeginFilter, sizeof(*this))
         , m_imageFilter(imageFilter)
         , m_webFilterOperations(filterOperations)
@@ -49,7 +49,7 @@ private:
 
 class PLATFORM_EXPORT EndFilterDisplayItem final : public PairedEndDisplayItem {
 public:
-    EndFilterDisplayItem(const DisplayItemClientWrapper& client)
+    EndFilterDisplayItem(const DisplayItemClient& client)
         : PairedEndDisplayItem(client, EndFilter, sizeof(*this)) { }
 
     void replay(GraphicsContext&) const override;