Revert of Add new gpu driver bug workaround DISABLE_TRANSPARENT_VISUALS

extensions/browser/api/app_window/app_window_apitest.cc

Index: extensions/browser/api/app_window/app_window_apitest.cc
diff --git a/extensions/browser/api/app_window/app_window_apitest.cc b/extensions/browser/api/app_window/app_window_apitest.cc
index 3d68f8626e6c0a2b07cb718e8542875fdd2eeb35..63ac734d842153fbe1796ac190c3da459112a44f 100644
--- a/extensions/browser/api/app_window/app_window_apitest.cc
+++ b/extensions/browser/api/app_window/app_window_apitest.cc
@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "base/strings/string_number_conversions.h"
@@ -24,10 +23,6 @@
 #include "ui/base/win/shell.h"
 #endif
 
-#if defined(USE_X11) && !defined(OS_CHROMEOS)
-#include "ui/gfx/x/x11_switches.h"
-#endif
-
 namespace extensions {
 
 namespace {
@@ -135,29 +130,19 @@
 
 IN_PROC_BROWSER_TEST_F(PlatformAppBrowserTest,
                        WindowsApiAlphaEnabledHasPermissions) {
-  const char kNoAlphaDir[] =
+  const char* no_alpha_dir =
       "platform_apps/windows_api_alpha_enabled/has_permissions_no_alpha";
-  const char kHasAlphaDir[] =
+  const char* test_dir = no_alpha_dir;
+
+#if defined(USE_AURA) && (defined(OS_CHROMEOS) || !defined(OS_LINUX))
+  test_dir =
       "platform_apps/windows_api_alpha_enabled/has_permissions_has_alpha";
-  ALLOW_UNUSED_LOCAL(kHasAlphaDir);
-  const char* test_dir = kNoAlphaDir;
-
-#if defined(USE_AURA) && (defined(OS_CHROMEOS) || !defined(OS_LINUX))
-  test_dir = kHasAlphaDir;
-
 #if defined(OS_WIN)
   if (!ui::win::IsAeroGlassEnabled()) {
-    test_dir = kNoAlphaDir;
+    test_dir = no_alpha_dir;
   }
 #endif  // OS_WIN
 #endif  // USE_AURA && (OS_CHROMEOS || !OS_LINUX)
-
-#if defined(USE_X11) && !defined(OS_CHROMEOS)
-  if (base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
-          switches::kWindowDepth) == "32") {
-    test_dir = kHasAlphaDir;
-  }
-#endif  // USE_X11 && !OS_CHROMEOS
 
   EXPECT_TRUE(RunPlatformAppTest(test_dir)) << message_;
 }