Remove unnecessary tab key press from Focus_AdvanceFocus test

The associated bug which required this extra tab is fixed.

Bug: 147644
Change-Id: Ied21533accc82613053e119aa2c5c64fc9de8343
Reviewed-on: https://chromium-review.googlesource.com/1170986Reviewed-by: Ehsan Karamad <ekaramad@chromium.org>
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582240}

chrome/browser/apps/guest_view/web_view_interactive_browsertest.cc

@@ -871,14 +871,6 @@ IN_PROC_BROWSER_TEST_F(WebViewFocusInteractiveTest, Focus_AdvanceFocus) {
     // move the focus to the next focusable element.
     ExtensionTestMessageListener listener("button1-advance-focus", false);
     listener.set_failure_message("TEST_FAILED");
-    // TODO(fsamuel): A third Tab key press should not be necessary.
-    // The <webview> will take keyboard focus but it will not focus an initial
-    // element. The initial element is dependent upon tab direction which blink
-    // does not propagate to the plugin.
-    // See http://crbug.com/147644.
-    content::SimulateKeyPress(embedder_web_contents, ui::DomKey::TAB,
-                              ui::DomCode::TAB, ui::VKEY_TAB, false, false,
-                              false, false);
     content::SimulateKeyPress(embedder_web_contents, ui::DomKey::TAB,
                               ui::DomCode::TAB, ui::VKEY_TAB, false, false,
                               false, false);