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

BUG=554298

Review URL: https://codereview.chromium.org/1902583002

Cr-Commit-Position: refs/heads/master@{#388093}
diff --git a/chrome/browser/diagnostics/diagnostics_controller.h b/chrome/browser/diagnostics/diagnostics_controller.h
index b62c5346..a98608b 100644
--- a/chrome/browser/diagnostics/diagnostics_controller.h
+++ b/chrome/browser/diagnostics/diagnostics_controller.h
@@ -5,8 +5,9 @@
 #ifndef CHROME_BROWSER_DIAGNOSTICS_DIAGNOSTICS_CONTROLLER_H_
 #define CHROME_BROWSER_DIAGNOSTICS_DIAGNOSTICS_CONTROLLER_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 
 namespace base {
@@ -53,7 +54,7 @@
   DiagnosticsController();
   ~DiagnosticsController();
 
-  scoped_ptr<DiagnosticsModel> model_;
+  std::unique_ptr<DiagnosticsModel> model_;
   DiagnosticsWriter* writer_;
 
   DISALLOW_COPY_AND_ASSIGN(DiagnosticsController);