Replace deprecated base::NonThreadSafe in chrome/browser/profiles.

chrome/browser/profiles/profile_manager.h

Index: chrome/browser/profiles/profile_manager.h
diff --git a/chrome/browser/profiles/profile_manager.h b/chrome/browser/profiles/profile_manager.h
index 385f9c360fe2b718b6a9556d811bb8f0a4532b2e..083970a25c7ad95b8a4bcbecc58fa68022a00d06 100644
--- a/chrome/browser/profiles/profile_manager.h
+++ b/chrome/browser/profiles/profile_manager.h
@@ -19,7 +19,7 @@
 #include "base/macros.h"
 #include "base/memory/linked_ptr.h"
 #include "base/message_loop/message_loop.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/threading/thread_checker.h"
 #include "build/build_config.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_metrics.h"
@@ -32,8 +32,7 @@
 class ProfileAttributesStorage;
 class ProfileInfoCache;
 
-class ProfileManager : public base::NonThreadSafe,
-                       public content::NotificationObserver,
+class ProfileManager : public content::NotificationObserver,
                        public Profile::Delegate {
  public:
   typedef base::Callback<void(Profile*, Profile::CreateStatus)> CreateCallback;
@@ -427,6 +426,13 @@ class ProfileManager : public base::NonThreadSafe,
   std::vector<Profile*> active_profiles_;
   bool closing_all_browsers_;
 
+  // TODO(chrome/browser/profiles/OWNERS): Usage of this in profile_manager.cc
+  // should likely be turned into DCHECK_CURRENTLY_ON(BrowserThread::UI) for
+  // consistency with surrounding code in the same file but that wasn't trivial
+  // enough to do as part of the mass refactor CL which introduced
+  // |thread_checker_|, ref. https://codereview.chromium.org/2907253003/#msg37.
+  THREAD_CHECKER(thread_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(ProfileManager);
 };