Use the screen info's scale factor to scale the drag image

third_party/WebKit/Source/web/WebViewImpl.h

Index: third_party/WebKit/Source/web/WebViewImpl.h
diff --git a/third_party/WebKit/Source/web/WebViewImpl.h b/third_party/WebKit/Source/web/WebViewImpl.h
index 9288a7fc621b5ae2f7b959ac7c3b368ccb018ec4..cc4c3254cb80633e2c82726c03aa3078a29c2026 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.h
+++ b/third_party/WebKit/Source/web/WebViewImpl.h
@@ -212,7 +212,6 @@ public:
     WebSize contentsPreferredMinimumSize() override;
     void setDisplayMode(WebDisplayMode) override;
 
-    float deviceScaleFactor() const override;
     void setDeviceScaleFactor(float) override;
     void setZoomFactorForDeviceScaleFactor(float) override;
 
@@ -628,6 +627,8 @@ private:
     void cancelPagePopup();
     void updatePageOverlays();
 
+    float deviceScaleFactor() const;
+
     WebViewClient* m_client; // Can be 0 (e.g. unittests, shared workers, etc.)
     WebSpellCheckClient* m_spellCheckClient;