Replace deprecated base::NonThreadSafe in content/browser/gpu in favor of SequenceChecker.

content/browser/gpu/gpu_process_host.h

Index: content/browser/gpu/gpu_process_host.h
diff --git a/content/browser/gpu/gpu_process_host.h b/content/browser/gpu/gpu_process_host.h
index 7572b2c9a4efa73e1316a0da25e576ea71c2a9a1..8cef249fd6a12813c9b8e0fec51bdccaf47cbe36 100644
--- a/content/browser/gpu/gpu_process_host.h
+++ b/content/browser/gpu/gpu_process_host.h
@@ -17,7 +17,7 @@
 #include "base/containers/hash_tables.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "content/common/content_export.h"
@@ -57,8 +57,7 @@ class BrowserChildProcessHostImpl;
 
 class GpuProcessHost : public BrowserChildProcessHostDelegate,
                        public IPC::Sender,
-                       public ui::mojom::GpuHost,
-                       public base::NonThreadSafe {
+                       public ui::mojom::GpuHost {
  public:
   enum GpuProcessKind {
     GPU_PROCESS_KIND_UNSANDBOXED,
@@ -292,6 +291,8 @@ class GpuProcessHost : public BrowserChildProcessHostDelegate,
   mojo::Binding<ui::mojom::GpuHost> gpu_host_binding_;
   gpu::GpuProcessHostActivityFlags activity_flags_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   base::WeakPtrFactory<GpuProcessHost> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuProcessHost);