Re-enable SelectToSpeakTest.SpeakStatusTray excluding official builds

On official builds, the unified status tray appears to be inactive; test
always fails. Re-enable for non-officila builds, which still exercises
views UI + STS reading.

R=akihiroota@chromium.org

Fixed: 1158879
Change-Id: I2fc7b4e6bb922c6d60aa819a73ce3a41b3afc003
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2595491
Auto-Submit: David Tseng <dtseng@chromium.org>
Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
Reviewed-by: Akihiro Ota <akihiroota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837680}

chrome/browser/chromeos/accessibility/select_to_speak_browsertest.cc

@@ -17,6 +17,7 @@
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/memory/weak_ptr.h"
+#include "build/branding_buildflags.h"
 #include "chrome/browser/chromeos/accessibility/accessibility_manager.h"
 #include "chrome/browser/chromeos/accessibility/speech_monitor.h"
 #include "chrome/browser/profiles/profile.h"
@@ -162,7 +163,13 @@ class SelectToSpeakTestWithLanguageDetection : public SelectToSpeakTest {
   }
 };
 
-IN_PROC_BROWSER_TEST_F(SelectToSpeakTest, DISABLED_SpeakStatusTray) {
+// The status tray is not active on official builds.
+#if BUILDFLAG(GOOGLE_CHROME_BRANDING)
+#define MAYBE_SpeakStatusTray DISABLED_SpeakStatusTray
+#else
+#define MAYBE_SpeakStatusTray SpeakStatusTray
+#endif
+IN_PROC_BROWSER_TEST_F(SelectToSpeakTest, MAYBE_SpeakStatusTray) {
   gfx::Rect tray_bounds = ash::Shell::Get()
                               ->GetPrimaryRootWindowController()
                               ->GetStatusAreaWidget()