Cleanup: Move ChromeClient::m_lastSetMouseCursorForTesting to ChromeClientImpl.

Source/web/WebPagePopupImpl.cpp

Index: Source/web/WebPagePopupImpl.cpp
diff --git a/Source/web/WebPagePopupImpl.cpp b/Source/web/WebPagePopupImpl.cpp
index 4b347236b72780029bcc70013fac56d94f1afe82..77728e1c8138f5331752dee013ca6223b5ac3fc7 100644
--- a/Source/web/WebPagePopupImpl.cpp
+++ b/Source/web/WebPagePopupImpl.cpp
@@ -142,7 +142,7 @@ private:
         return IntSize(0, 0);
     }
 
-    void setCursorInternal(const Cursor& cursor) override
+    void setCursor(const Cursor& cursor) override
     {
         if (m_popup->m_webView->client())
             m_popup->m_webView->client()->didChangeCursor(WebCursorInfo(cursor));