Convert //content/browser from scoped_ptr to std::unique_ptr

BUG=554298
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Review URL: https://codereview.chromium.org/1874893002

Cr-Commit-Position: refs/heads/master@{#386285}
diff --git a/content/browser/tracing/tracing_ui.h b/content/browser/tracing/tracing_ui.h
index 4e65de1..fdbe0c19 100644
--- a/content/browser/tracing/tracing_ui.h
+++ b/content/browser/tracing/tracing_ui.h
@@ -33,8 +33,8 @@
   void DoUpload(const base::ListValue* args);
   void DoUploadBase64Encoded(const base::ListValue* args);
 
-  scoped_ptr<TracingDelegate> delegate_;
-  scoped_ptr<TraceUploader> trace_uploader_;
+  std::unique_ptr<TracingDelegate> delegate_;
+  std::unique_ptr<TraceUploader> trace_uploader_;
   base::WeakPtrFactory<TracingUI> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TracingUI);