[GTK] REGRESSION(r243653) unexpected test failure

[Diego Pino]

r243653 (Pasting a table from Confluence strip of table cell content https://bugs.webkit.org/show_bug.cgi?id=196390) added a new test: 'editing/pasteboard/paste-content-with-overflow-auto-parent-across-origin.html', which is failing in GTK.

```
--- /WebKit/WebKitBuild/Release/layout-test-results/editing/pasteboard/paste-content-with-overflow-auto-parent-across-origin-expected.txt
+++ /WebKit/WebKitBuild/Release/layout-test-results/editing/pasteboard/paste-content-with-overflow-auto-parent-across-origin-actual.txt
@@ -4,13 +4,14 @@
 
 
 PASS markup.includes("secret") is false
-PASS markup.includes("Start</div>") is true
-PASS markup.includes("Content</p>") is true
-PASS markup.includes("End</span>") is true
-PASS editor.querySelector("div").textContent is "Start"
-PASS editor.querySelector("p").textContent is "Content"
-PASS editor.querySelector("span").textContent is "End"
+FAIL markup.includes("Start</div>") should be true. Was false.
+FAIL markup.includes("Content</p>") should be true. Was false.
+FAIL markup.includes("End</span>") should be true. Was false.
+FAIL editor.querySelector("div").textContent should be Start. Threw exception TypeError: null is not an object (evaluating 'editor.querySelector("div").textContent')
+FAIL editor.querySelector("p").textContent should be Content. Threw exception TypeError: null is not an object (evaluating 'editor.querySelector("p").textContent')
+FAIL editor.querySelector("span").textContent should be End. Threw exception TypeError: null is not an object (evaluating 'editor.querySelector("span").textContent')
 PASS successfullyParsed is true
+Some tests failed.
```

[Carlos Garcia Campos]

*** This bug has been marked as a duplicate of bug 177633 ***