Remove OS_CHROMEOS from ui/ash code

chrome/browser/ui/ash/chrome_shell_content_state.cc

Index: chrome/browser/ui/ash/chrome_shell_content_state.cc
diff --git a/chrome/browser/ui/ash/chrome_shell_content_state.cc b/chrome/browser/ui/ash/chrome_shell_content_state.cc
index a7205714d50e841ff964dea3c15ef25815a5fe06..4de2fe820ffdc90203871ca1d4423510ff36cd99 100644
--- a/chrome/browser/ui/ash/chrome_shell_content_state.cc
+++ b/chrome/browser/ui/ash/chrome_shell_content_state.cc
@@ -6,18 +6,13 @@
 
 #include "build/build_config.h"
 #include "chrome/browser/profiles/profile_manager.h"
-#include "content/public/browser/browser_context.h"
-
-#if defined(OS_CHROMEOS)
 #include "components/user_manager/user_manager.h"
-#endif
+#include "content/public/browser/browser_context.h"
 
 ChromeShellContentState::ChromeShellContentState() {}
 ChromeShellContentState::~ChromeShellContentState() {}
 
 content::BrowserContext* ChromeShellContentState::GetActiveBrowserContext() {
-#if defined(OS_CHROMEOS)
   DCHECK(user_manager::UserManager::Get()->GetLoggedInUsers().size());
-#endif
   return ProfileManager::GetActiveUserProfile();
 }