Fix flaky test TabletModePageBehaviorTest.ExcludeInternalPages

The test used to navigate to chrome://settings, which may take
a long time causing the test to flake. The test's intent is to
verify correct WebPrefs applied when switching to tablet mode
for internal pages; doesn't have to be the settings page.
Use chrome://version instead.

BUG=1023903
TEST=Run test locally with no flakes

Change-Id: I5bc62a1eb9d67e1d0ca62693110081d4fd512974
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1913020
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714698}

chrome/browser/ui/ash/tablet_mode_page_behavior_browsertest.cc

@@ -12,6 +12,7 @@
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/url_constants.h"
+#include "chrome/common/webui_url_constants.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host.h"
@@ -114,14 +115,13 @@ IN_PROC_BROWSER_TEST_F(TabletModePageBehaviorTest,
 }
 
 IN_PROC_BROWSER_TEST_F(TabletModePageBehaviorTest, ExcludeInternalPages) {
-  constexpr char kSettingsUrl[] = "chrome://settings/";
-  AddTabAtIndexToBrowser(browser(), 0, GURL(kSettingsUrl),
+  AddTabAtIndexToBrowser(browser(), 0, GURL(chrome::kChromeUIVersionURL),
                          ui::PAGE_TRANSITION_LINK,
                          false /* check_navigation_success */);
   auto* web_contents = GetActiveWebContents(browser());
   ASSERT_TRUE(web_contents);
   EXPECT_STREQ(web_contents->GetLastCommittedURL().spec().c_str(),
-               kSettingsUrl);
+               chrome::kChromeUIVersionURL);
 
   // Now enable tablet mode, and expect that this internal page's web prefs
   // remain unaffected as if tablet mode is off.