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

content/browser/accessibility/browser_accessibility_win.h

Index: content/browser/accessibility/browser_accessibility_win.h
diff --git a/content/browser/accessibility/browser_accessibility_win.h b/content/browser/accessibility/browser_accessibility_win.h
index 82e03ca8b6ce38b91144c2fecb54a3c6ef9895ef..b43eda18a2dff2ba556f8075f67b769076ab8350 100644
--- a/content/browser/accessibility/browser_accessibility_win.h
+++ b/content/browser/accessibility/browser_accessibility_win.h
@@ -923,11 +923,11 @@ BrowserAccessibilityWin
     std::vector<int32_t> hyperlinks;
   };
 
-  scoped_ptr<WinAttributes> win_attributes_;
+  std::unique_ptr<WinAttributes> win_attributes_;
 
   // Only valid during the scope of a IA2_EVENT_TEXT_REMOVED or
   // IA2_EVENT_TEXT_INSERTED event.
-  scoped_ptr<WinAttributes> old_win_attributes_;
+  std::unique_ptr<WinAttributes> old_win_attributes_;
 
   // Relationships between this node and other nodes.
   std::vector<BrowserAccessibilityRelation*> relations_;