Enable the volume slider in Ash for windows.

chrome/test/base/in_process_browser_test.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/test/base/in_process_browser_test.h"
 
 #include "base/auto_reset.h"
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 184 matching lines @@
   captive_portal::CaptivePortalService::set_state_for_testing(
       captive_portal::CaptivePortalService::DISABLED_FOR_TESTING);
 #endif
 
   chrome_browser_net::NetErrorTabHelper::set_state_for_testing(
       chrome_browser_net::NetErrorTabHelper::TESTING_FORCE_DISABLED);
 
   google_util::SetMockLinkDoctorBaseURLForTesting();
 
 #if defined(OS_WIN)
-  if (base::win::GetVersion() >= base::win::VERSION_WIN8 &&
+  base::win::Version version = base::win::GetVersion();
+  if (version >= base::win::VERSION_WIN7 &&
       CommandLine::ForCurrentProcess()->HasSwitch(switches::kAshBrowserTests)) {
     com_initializer_.reset(new base::win::ScopedCOMInitializer());
     ui::win::CreateATLModuleIfNeeded();
-    ASSERT_TRUE(win8::MakeTestDefaultBrowserSynchronously());
+    if (version >= base::win::VERSION_WIN8)
+      ASSERT_TRUE(win8::MakeTestDefaultBrowserSynchronously());
   }
 #endif
 
   BrowserTestBase::SetUp();
 }
 
 void InProcessBrowserTest::PrepareTestCommandLine(CommandLine* command_line) {
   // Propagate commandline settings from test_launcher_utils.
   test_launcher_utils::PrepareBrowserCommandLineForTests(command_line);
 
@@ skipping 247 matching lines @@
   // On the Mac, this eventually reaches
   // -[BrowserWindowController windowWillClose:], which will post a deferred
   // -autorelease on itself to ultimately destroy the Browser object. The line
   // below is necessary to pump these pending messages to ensure all Browsers
   // get deleted.
   content::RunAllPendingInMessageLoop();
   delete autorelease_pool_;
   autorelease_pool_ = NULL;
 #endif
 }