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

content/browser/accessibility/browser_accessibility_manager.cc

Index: content/browser/accessibility/browser_accessibility_manager.cc
diff --git a/content/browser/accessibility/browser_accessibility_manager.cc b/content/browser/accessibility/browser_accessibility_manager.cc
index f7714fa592bf8101aa177b726c41218bb37f05e0..17c72919c0bed22102856937886275435aab23e7 100644
--- a/content/browser/accessibility/browser_accessibility_manager.cc
+++ b/content/browser/accessibility/browser_accessibility_manager.cc
@@ -844,10 +844,9 @@ BrowserAccessibilityDelegate*
 
 ui::AXTreeUpdate
 BrowserAccessibilityManager::SnapshotAXTreeForTesting() {
-  scoped_ptr<ui::AXTreeSource<const ui::AXNode*,
-                              ui::AXNodeData,
-                              ui::AXTreeData> > tree_source(
-      tree_->CreateTreeSource());
+  std::unique_ptr<
+      ui::AXTreeSource<const ui::AXNode*, ui::AXNodeData, ui::AXTreeData>>
+      tree_source(tree_->CreateTreeSource());
   ui::AXTreeSerializer<const ui::AXNode*,
                        ui::AXNodeData,
                        ui::AXTreeData> serializer(tree_source.get());