Add code and key into the browser test key simulation methods.

chrome/browser/apps/guest_view/web_view_browsertest.cc

Index: chrome/browser/apps/guest_view/web_view_browsertest.cc
diff --git a/chrome/browser/apps/guest_view/web_view_browsertest.cc b/chrome/browser/apps/guest_view/web_view_browsertest.cc
index ee56025f58048bd6f68a58e52caabeea44f0b55e..5ee145e3b931784b9df7607ea3070de80f69fed1 100644
--- a/chrome/browser/apps/guest_view/web_view_browsertest.cc
+++ b/chrome/browser/apps/guest_view/web_view_browsertest.cc
@@ -3109,8 +3109,9 @@ IN_PROC_BROWSER_TEST_P(WebViewAccessibilityTest, FocusAccessibility) {
   // Now keep pressing the Tab key until focus lands on a button.
   while (content::GetFocusedAccessibilityNodeInfo(web_contents).role !=
              ui::AX_ROLE_BUTTON) {
-    content::SimulateKeyPress(
-        web_contents, ui::VKEY_TAB, false, false, false, false);
+    content::SimulateKeyPress(web_contents, ui::DomKey::FromCharacter('\t'),
+                              ui::DomCode::TAB, ui::VKEY_TAB, false, false,
+                              false, false);
     content::WaitForAccessibilityFocusChange();
   }