Remove unexpected user gesture creation in a test.

Bug: 902517
Change-Id: Ie5121198b9ce41e2d72ea696570b05de0071aafa
Reviewed-on: https://chromium-review.googlesource.com/c/1321156Reviewed-by: Camille Lamy <clamy@chromium.org>
Commit-Queue: Mustaq Ahmed <mustaq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606505}

content/browser/navigation_browsertest.cc

@@ -1138,7 +1138,8 @@ IN_PROC_BROWSER_TEST_F(NavigationBrowserTest, HistoryBackInBeforeUnload) {
   GURL url_2(embedded_test_server()->GetURL("/title2.html"));
 
   EXPECT_TRUE(NavigateToURL(shell(), url_1));
-  EXPECT_TRUE(ExecuteScript(shell()->web_contents(),
+  EXPECT_TRUE(
+      ExecuteScriptWithoutUserGesture(shell()->web_contents(),
                                       "onbeforeunload = function() {"
                                       "  history.pushState({}, null, '/');"
                                       "  history.back();"
@@ -1156,7 +1157,8 @@ IN_PROC_BROWSER_TEST_F(NavigationBrowserTest,
   GURL url_2(embedded_test_server()->GetURL("/title2.html"));
 
   EXPECT_TRUE(NavigateToURL(shell(), url_1));
-  EXPECT_TRUE(ExecuteScript(shell()->web_contents(),
+  EXPECT_TRUE(
+      ExecuteScriptWithoutUserGesture(shell()->web_contents(),
                                       "onbeforeunload = function() {"
                                       "  history.pushState({}, null, '/');"
                                       "  setTimeout(()=>history.back());"