Make DisplayItemClient an interface

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

Index: third_party/WebKit/Source/platform/graphics/paint/ScrollDisplayItem.h
diff --git a/third_party/WebKit/Source/platform/graphics/paint/ScrollDisplayItem.h b/third_party/WebKit/Source/platform/graphics/paint/ScrollDisplayItem.h
index d3b2b08170c47d87d56309b8c29643d3b07b30e1..73ca8c13ac18f58c661f124d38b9452969112c43 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/ScrollDisplayItem.h
+++ b/third_party/WebKit/Source/platform/graphics/paint/ScrollDisplayItem.h
@@ -14,7 +14,7 @@ namespace blink {
 
 class PLATFORM_EXPORT BeginScrollDisplayItem final : public PairedBeginDisplayItem {
 public:
-    BeginScrollDisplayItem(const DisplayItemClientWrapper& client, Type type, const IntSize& currentOffset)
+    BeginScrollDisplayItem(const DisplayItemClient& client, Type type, const IntSize& currentOffset)
         : PairedBeginDisplayItem(client, type, sizeof(*this))
         , m_currentOffset(currentOffset)
     {
@@ -43,7 +43,7 @@ private:
 
 class PLATFORM_EXPORT EndScrollDisplayItem final : public PairedEndDisplayItem {
 public:
-    EndScrollDisplayItem(const DisplayItemClientWrapper& client, Type type)
+    EndScrollDisplayItem(const DisplayItemClient& client, Type type)
         : PairedEndDisplayItem(client, type, sizeof(*this))
     {
         ASSERT(isEndScrollType(type));