Replace deprecated base::NonThreadSafe in chrome in favor of SequenceChecker.

chrome/browser/browser_process_platform_part_chromeos.h

Index: chrome/browser/browser_process_platform_part_chromeos.h
diff --git a/chrome/browser/browser_process_platform_part_chromeos.h b/chrome/browser/browser_process_platform_part_chromeos.h
index e0c970e1ca2fe60110dc3cf83f0382c9774d886f..11348eff2390ecc856c82b8a99716db19e69d0f3 100644
--- a/chrome/browser/browser_process_platform_part_chromeos.h
+++ b/chrome/browser/browser_process_platform_part_chromeos.h
@@ -11,7 +11,7 @@
 #include "base/compiler_specific.h"
 #include "base/containers/flat_set.h"
 #include "base/macros.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "chrome/browser/browser_process_platform_part_base.h"
 
 namespace chromeos {
@@ -38,8 +38,7 @@ class BrowserPolicyConnectorChromeOS;
 
 class ScopedKeepAlive;
 
-class BrowserProcessPlatformPart : public BrowserProcessPlatformPartBase,
-                                   public base::NonThreadSafe {
+class BrowserProcessPlatformPart : public BrowserProcessPlatformPartBase {
  public:
   BrowserProcessPlatformPart();
   ~BrowserProcessPlatformPart() override;
@@ -132,6 +131,8 @@ class BrowserProcessPlatformPart : public BrowserProcessPlatformPartBase,
 
   base::flat_set<std::string> compatible_cros_components_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(BrowserProcessPlatformPart);
 };